Building My Own Stealth Antenna
from
Penny C Larson, KG7MCH
on
December 26, 2008
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Building My Own Stealth Antenna
I read the article from KB2DHG about making his own antenna, and I wanted to try it too. One month earlier, I had obtained my general license and was excited to get on HF. But I had a couple things I needed to work out. One, I lived in a CCR, and two, my radio would be on the second floor of the house.
A local 2-meter net gave me some wonderful ideas to try on making a good ground and about hiding antenna wire under the eaves of the house.
So, with several of these ideas in my mind, I took apart a "slinky" antenna I had purchased on eBay. Due to my restrictions, the "slinky" wasn't a good choice, but the PVC tee and the way that the coax wound around the PVC several times before running up through the center to meet the ends of each "slinky" seemed to work very well. I removed the two slinky ends and soldered 12 gauge wires (51 feet each) to the coax and covered the connection with tape.
I secured the PVC with nylon rope and a screw-in hook, and placed it into the top peak of eaves (on the back-side of the house). Each wire leg of my antenna was stapled to the under-side of the eaves as they ran down from the second story to the first.
To add to the stealth of the antenna, I painted everything I could with the same color as the house.
I have found that this wire antenna works very well on 75 meters, as I check into the Night-Train Net (3.900) on a regular basis at 9 P.M (pacific-time), using a MFJ 949E tuner and using either my Yaesu ft-101EE, or an Icom 706MKIIG. It is really thrilling to be talking on something I built and put up.
I would like to thank the many HAMS that submit to these sites. Without you, many of us would just give up amateur radio before giving it a chance due to the hurdles we must overcome.
My next antenna project will be the "flag-pole" Hustler 5-BTV. I have already begun reading the many different versions of this on-line.
73
KG7MCH
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Building My Own Stealth Antenna
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by EC158 on December 26, 2008
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very nice...I'd like to try something similar as long as it loads up on all bands. How was the performance on the other bands?
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by G8UBJ on December 26, 2008
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Well done, nobody will notice that one.
If you could place the wires about 6" away from the gable on stand-offs it would perform even better. Could you use thin wire & dress it up as a bird deterrent?
73 and HNY G8UBJ
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by N5PVL on December 26, 2008
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I once made something very similar. The louvered vent on my old place was wooden, allowing me to locate the balun and coax in the attic, with only the two wires going outside.
It was very difficult to detect from the ground, and worked well.
Charles, N5PVL
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by W4FID on December 26, 2008
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This is a slick solution and you can't argue with the results -- any stealth antenna that works on 75 is a good thing! The 51 ft per leg and balun at the feed point are good choices that should give good odds that with a wide tuner you'll load and work OK on other bands.
The comment about a little spacing is worth noteing. Wet or humid wood will detune the antenna since it's stapled right to the wood. Space - if you could get some -- will reduce that factor. Also don't forget that even at 100 watts there will be high voltage -- probably hundreds to a couple thousand volts -- at the ends of the wire. Lack of proper insulation could result in a fire if there were any arcing to combustible materials and "plain vanilla" house wire is typically not rated at more than 600 volts (often less) so it's not enough.
Not mentioned but important. This is a wood construction home. Many buildings have aluminum eves, sofetts, or gutters and this idea won't work with them. They act as a giant capacitor and RF sponge so performance will be from poor to really sucks. Even worse ...... with aluminum -- or any metal -- that close to RF if there is corrosion in the joints between the metal pieces of the home and you don't connect each and every piece with a strap the joint(s) will act as a diode and turn into the wide band interfearance radiator from hell.
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by K6YE on December 26, 2008
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Penny,
Great article on your part. In the 1980s, I lived in a condo for two years and had to take a different approach. I waited until the units were re-roofed and stapled my dipole to the top of the vee and ran it the entire length of the roof. I wound an excellent 1:1 balun, out of teflon coax, and brought the feeder coax behind a gutter.
When other owners inquired what I was doing on the roof, I simply told them that I was replacing the screens on the ventilation strips. It worked.
While not the greatest antenna, I managed to work some 20 meter DX via a net run by W6BF, Phineas Icenbice. It is true that necessity is the mother of invention.
I have owned four residences since then and for me the number one requirement is the absence of HOA/CC&Rs and any city/county tower/antenna restrictions. We moved from California to Colorado in 2004 and had to look at a lot of homes. I now have a 54-foot crank-up tower, big HF yagi, and a couple of dipoles.
No matter what one has in the way of antennas, the main object is to have fun and enjoy the hobby.
Keep up the good work.
Semper Fi,
Tommy - K6YE
DX IS
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by K3AN on December 26, 2008
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Glad you're on the air. And remember that any antenna is better than no antenna.
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by KG6WLS on December 26, 2008
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Great job, Penny! If you’re having fun and making contacts, that’s all that really matters.
I lived in a condo complex before I got my ham license, and had a similar arrangement. After I got my ticket, I had a hidden loop, a dipole, and a 23’ ground mount telescoping vertical with an AH-4 tuner and radials. Now, I can put up what ever I want at the new QTH.
100 watts or less can get out with CW and PSK. Enjoy the bands and never give up in a situation like yours.
73
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by K7JQ on December 26, 2008
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Way to go, Penny. I had the EXACT same set-up in a previous house restricted by CC&R's. I did a full-sized 80 meter dipole down the back and continued along the sides of the house. Unfortunately, the house was stucco, backed with chicken wire,and it was a VERY marginal performer with noise and RFI problems..
If you have problems with the size of your proposed Hustler vertical, here's a suggestion. In my current house (also CC&R restricted), I am using a ground-mounted motorized screwdriver antenna, which operates 10-80 meters with near perfect SWR's...no need for a tuner. You'll need a system of radials of random length stapled to the ground for optimum performance (which you will need for the 5BTV anyway). The tube with the moving coil is only about 4 feet, with a 6 foot whip on top....VERY stealth. Try to position it away from the house and any surrounding objects, as you should do with the proposed flagpole. This system has worked very well for me and is virtually invisible to prying eyes. Good luck with your future plans.
73, Bob, K7JQ
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by KF7CG on December 26, 2008
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Great work on a hidden antenna!
Lest we forget, that thing ain't legal in Palmdale, CA unless their situation changes. Palmdale's ordinance when it is translated to simple english is : If we can see it, you are going to have to go through alot of red tape and pay for it every year and every time your neighbor thinks that he has interference. "less than 1" above roof line and not visible for any public right of way or from neighboring properties, even those taller than the one with the antenna"
This is not to say that we should attempt to keep all antenna reasonably presentable and if possible without harming performance reduce their visual impact (though I do like the looks of a well maintained tower and beam). We must all just be vigilant to prevent regulations from sending us all QRT except for mobile and UHF.
Hope everyone had a Joyous Christmas and has a Happy New Year.
David
KF7CG
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by K1CJS on December 26, 2008
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A nice solution to a problem--using some premade antenna parts and improving on the antenna as a whole. This is an excellent way to 'hide' an antenna right out in plain sight!
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by KG6EJT on December 26, 2008
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Great idea. I tried something similar to that at my QTH, but I ran into all kinds of RFI issues with TV's in the house. WB2WIK (Steve) said on here that it was probably due to the antenna interacting with metal in the stucco walls, roof nails, etc.
I'm glad to hear this is working for you.
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by W8KQE on December 26, 2008
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Great article! I used to run eave mounted inverted stealth dipoles like this on 10 and 15 meters (about 20 to 25 feet off the ground), during a previous solar cycle peak in the 80's. 100w from a Kenwood 430S, and I worked the world, no problems! When there's a will, there's a way.
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by W7ETA on December 26, 2008
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Nice pix.
Good prose.
Thanks for creating and posting the article.
Best from Tucson
Bob
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by W6ONV on December 26, 2008
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Thanks for the idea! I am currently looking into how I can get a second antenna on the air. I received approval from my HOA to erect my 6-BTV with a few guidelines I due up. I will have to see if I can rig something like you did in the eaves of the house.
Prior to approval for the 6-BTV being put up, I did raise it as a flagpole, with mixed results. You can read about my experiences with it on my web site:
http://the6thfloor.com/news.php?item.253.9
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by W4VR on December 26, 2008
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...glad it's working out for you. As long as you keep the power level down you should be OK with RFI, RADHAZ, and your house not catching on fire.
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by AB0RE on December 26, 2008
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Thanks for the good write-up and for taking the time to post a picture as well.
Does your feedline run down the side of the house or enter through the attic vent?
My only concern would be the loss of the coax feeding your doublet. You could get away from this by either switching to ladderline or remote-mounting a tuner either under the eve of your roof or just inside the attic.
73,
Dan / ab0re
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by N6AJR on December 26, 2008
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I did almost the same for my first antenna in 1978 in a apartment I lived in at the time. good job and nice writeup.
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Building My Own Stealth Antenna
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by KB2DHG on December 26, 2008
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I am thrilled that you found my article to be an encouragement to build your own antenna. Yes, HOA's and any other restrictions can be devistating to us. BUT as I did you forged ahead and triumphed.
It is a great feeling when you construct something and get it to work. Keep us informed as to the results of your antenna, My antenna is yealding me many good DX contacts.
Congradulations and NEVER GIVE UP!
Nice article.
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by AB5XZ on December 26, 2008
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On CC&Rs, here's my little success story.
When I planned to buy this house, I read the deed restrictions carefully and found that they permitted an antenna with the permission of the Architectural Control Committee (actually, the language has typos that render the restriction nonsensical, but I'm not testing it). I found that a guy in the neighborhood, already on the ACC, had installed an antenna in the greenbelt behind his house. I also found that he was on the ACC. So I contacted him and asked for his advice as to how to proceed. He recommended that I just do the paperwork and drown them in details. So that's what I did. I installed a tilt-down 6-band trap vertical from DX Engineering. It works well, for a vertical. Next Homeowners Association meeting, I volunteered for the ACC. The original ham and the chairman both moved from the neighborhood, so I'm chairman of the ACC. I "packed" the ACC with two friends who understand about ham radio. No other ham has moved to the neighborhood, but it's a reasonable place to do ham radio. I'm working on redoing my WAS because I've moved more than 50 miles since I earned it. I can operate most HF contests and do reasonably well. With some more sunspots I will do fine.
I applaud the builder of the stealth antenna. I don't think it would work on my house because of the thermalguard roof decking (plywood with aluminum foil lining). My vertical works fine, being about 35 feet from the house.
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by K0UA on December 26, 2008
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Good article Penny, let us know how well this continues to work, and any problems you might encounter and how you solved them. Glad to see write-ups like this.
73
James
K0UA
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by VA3TSK on December 26, 2008
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Way to go! I live in a small-lot townhouse and cant put up a tower, so I know what you're going through. I don't know if you're on CW, but since I've learned code I feel like I have a lot better luck making contacts on a less-than-perfect antenna. You might want to give it a try.
Cheers, Greg, VA3TSK
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by AA4PB on December 26, 2008
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Good job. I notice from your picture that everything is wood. You are fortunate because many gable ends are covered with aluminum and the same antenna setup wouldn't work worth a darn installed up against conductive material like that. I guess there is no "one size fits all" when it comes to antennas.
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by KG4CLD on December 26, 2008
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It isn't the best design, but it really does works!
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by W4LGH on December 27, 2008
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Getting on the air is the most important thing, and you did a great job at hiding the antenna. However you have several major things that could be a problem. One, using a tuner fed with coax, has some major loss, both transmit and receive. Two, the wire being stapled directly on the wood, COULD cause a fire. Yes the chances are very slim, but they are there, none the less. It would be a much better idea to use at least 4" stand-offs and get the wire away from the wood. Being painted the same color as the house, no one would ever see it! This would make it work much better, and be a lot safer. I would also look into an SGC auto-tuner, which would go directly at the antenna, cutting out a lot of the loss, and also matching your 51' wire better.
These changes would make some serious improvements in your antenna design, that you would see immediately see, both in receiving signals, and a little better transmit signal. It would also make you house a little safer from fire, and your antenna more stable from wet to dry conditions.
73 es gud DX
de W4LGH - Alan
http://www.w4lgh.com
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by K3JLS on December 27, 2008
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Hi Penny - very nice job and commentary!
If you have the time and inspiration, you might want to consider an automatic antenna coupler (like the SGC-239) close to the feedpoint of your antenna. You can mount it just inside your soffit and even feed the DC power to it over the coax.
The net result will be near automatic tuning, less RF wasted in the coax, and operation on the higher frequencies.
If you can find a way to lengthen the 'legs' of the inverted vee, you might be able to work 160 meters with the auto-tuner.
I use an SGC-239 with a 130 foot loop in my attic and it works out pretty well.
Good Luck!
Joe - K3JLS
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by WB1BPV on December 27, 2008
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Sounds like a great setup. I have a situation that is worse. I live in a brick condo,second floor,no balcony,metal gutters, no trees to rig a stealth antenna and I am in a valley. I have no problem with VHF/UHF, but HF is on the back burner till we get a house, hopefully within the next 2 years.Enjoy your setup. 80 meters is getting better and better even with the low sunspot cycle.
73's
David
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by WB1BPV on December 27, 2008
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Sounds like a great setup. I have a situation that is worse. I live in a brick condo,second floor,no balcony,metal gutters, no trees to rig a stealth antenna and I am in a valley. I have no problem with VHF/UHF, but HF is on the back burner till we get a house, hopefully within the next 2 years.Enjoy your setup. 80 meters is getting better and better even with the low sunspot cycle.
73's
David
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by N6CIC on December 27, 2008
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Good work Penny-any antenna is better than no antenna and it is remarkable you are able to do so well on 80 meters. When I lived in a CC&R restricted neghborhood, I first tried attic antennas, but with very little success. I then went to a 20-meter sloping dipole which I would put out the second story at night. That worked much better, but I could not use it during the day. I was going to put up a flagpole antenna, but we moved. I applaud all those who have to install stealth antennas and keep up their love of this great hobby.
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by KC5ZSR on December 28, 2008
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My solution to the CC&R problem was similar. Our house is a single story and the shack is in the basement. I went up to the gable with 300 ohm twin lead to a home made PVC fitting, and from there went down the gable and around on the sides of the house. The side legs are only about 9' off the ground. Rather than using staples to secure the wire to the eaves, I made short PVC stand-offs. The side legs of the antenna are about 1 foot from the seamless aluminum gutter, and one leg passes within 8' of our computer. So far there have been no RFI problems. When I first tuned up on 20 meters I got 5/8 and 5/9 reports from the west coast, and a 5/3 from Belgium. Using 80 watts from Cheyenne, WY I am satisfied with that.
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by AF6AU on December 29, 2008
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Good job, and you are lucky.
I live within 300 yards of the hills in So. Calif. that burned a few weeks ago, (GdSq DM13BW) so I have a single story C.C.R. area home, with a concrete tile roof full of iron wire bits, so attic and eaves antennas don't do well. The other issue is the neighborhood is fairly high density, so my local QRM is quite high from the plethora of close-by electronics ranging from WiFi, portable phones, to plasma televisions. Add to the mix local broadcast FM and AM within 1 mile, and 50KW KFI 640Khz 13 miles west. Most of the 24 hour day, the QRM below 20M is S-9 and higher. I use the Ameritron at 600W for short bursts late at night, because I know it wrecks the usefulness of a lot of neighbor's technology. As it is I do a lot of neighbor goodwill and schmoozing to soften the image of the antennas, with the usual "During an emergency I will be the only communication this neighborhood will have", and help everyone with computers and TV hookups. Goodwill earns a lot of tolerance.
I have a quick up/down 35 foot tall, guyed, fiberglass mast, using full size inverted 'v' dipole setup that can be used from 40 meters and up, that does work. For 20M and higher, I use dipoles or wire ground planes. It seems that no matter what antenna I hoist up, the receive QRM, makes me dream for another So. Calif. blackout, so I can hear.
Soon I will experiment with 1 wave delta loops, maybe they will reject the near-the-ground RFI better.
Anybody out there using a loop, and how well do they reject RFI???
JML
AF6AU
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by N5LRZ on December 29, 2008
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Good idea HOWEVER, any HOA inspection team walking around the yard, home looking to find an external antenna of any type can see that balun, coax and wire extremely easily. Too damn easy as a matter of pure fact.
Here is what ya do with the principle being applied....
Use smaller magnet wire (ditch that large house wire because it is still far far too visible) held in place using tot 50 or other small staples. Bring that balun feedpoint completely inside the attic by extending the previously mentioned small wire feed point into the attic itself where it will attach to the balun completely out of sight.
HERE IS THE REAL TRICK...Paint OVER your small antenna wire using house paint to match the house color so as to completely cover/camoflage the wire to the point where you cannot even see it even looking directly at it.
You know you have camoflaged it ehough IF the HOA inspection team can walk anywhere on your property and never ever get a wiff of any kind of external antenna even if they are looking directly at it from a fairly close range.
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by AD7WN on December 29, 2008
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Well done, Penny. My only caution would be the fact that the radiating wires are directly against the wood material. Near the outer ends of the radiating elements there will be very high voltages, even with power levels of the order of 100 watts. These voltages may well exceed the insulation rating of these wires, with the possibility of starting a fire. While the likelihood of this happening may seem remote, it could void your fire insurance policy. If you can manage it, it might be a good idea to provide some kind of hard-to-see standoff insulators to space the wires out from the wood members. In my college days (in the really dim past) I solved this problem with #30 magnet wire and rubber bands.
Other than that, I have no problem with your project. Thanks for a good write-up.
73 de John
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by VE7IG on December 31, 2008
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A few years ago there was an article in one of the magazines about someone who had a loop antenna taped around the perimeter of one living room wall up on the third floor of an old apartment building. There was an automatic antenna tuner right at the bottom centre of the loop. I believe he worked all over the place with about 50 watts on PSK31.
Someone had the right idea, though. Just avoid all those condos, subdivisions or whatever like the plague.
Here is one idea. Instead of selling your home and moving into one of those places, rent it with your ham equipment locked into a basement room and remoted. Then you can operate it over the internet.
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by WA4UF on January 4, 2009
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Don't discount out-of-hand the notion of putting the antenna *inside* the attic. That avoids the whole "hiding an external antenna I'm not supposed to have" issue (and by inference the moral quicksand of "it's only wrong if I get caught" (you know, like chickenbanders with linears) and subsequent negative impressions formed of the ham radio community), and while it's not a great performer, a diple in the attic can be made to work. My dad operated that way for 30 years - just an 80m dipole up in the attic. The ends had to sort of zigzag around the ends of the attic. It was less than optimal, but it did let him get on the air. Granted, in Dad's case the only authority he had to pass was Mom's sense of backyard aesthetics, but still... :-)
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by N2WJW on January 4, 2009
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Great job! I also live in an antenna restricted zone, my stealth antennas are a G5RV jr. in the attic and a very thin gage magnet wire endfed that I put up from a tree to the side of the house. To my amazement, the g5rv jr works wonders in the attic, I first had it taped to the wood ceiling but taking someone's advice, now I have it strung with cord away from the wood, not only for safety but also for performance since the antenna being against the wooden surface did not work as well as being suspended by strings, I get superb signal reports from 40m to 10m using low power on CW. The endfed works good on 80m and its only visible if you look really hard for it. I hope this encourages and helps someone out there in CCR land.
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by N5WFH on January 5, 2009
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Thanks for the idea! I live in a deed restricted area and the slinky antenna in the attic can only do so much and I am always looking for ideas to create a better antenna.
73's
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by N5WFH on January 5, 2009
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Thanks for the idea! I live in a deed restricted area and the slinky antenna in the attic can only do so much and I am always looking for ideas to create a better antenna.
73's
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by KG7MCH on January 5, 2009
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I would like to thank everyone that have posted on this subject. I must say I was taken by surprise about "setting my house on fire" comments and have quickly moved to improve my antenna.
I have placed plastic (electric fence) insulators between the wire of my antenna and the wooden eves of our house.
I have to say to anyone making one of these types of antennas, to do this! It makes the antenna tune better on all the bands.
73's
Penny
kg7mch
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by KA8NSG on January 5, 2009
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I myself finally got back on the air also on HF. At the moment I am using a 65ft length of #12,THHN streched from one end of my apartment to the other, at ceiling level. It follows the walls and such. Its not exacty straight. With my MFJ 949E Tuner. My Heathkit SB102 loads up well and operates. Its temporary until I get my homebrew vertical finished and trimmed.
I have been on the air on 3920 kc at 1300 EST for the Van Wert Area Emergency Net, and on 3930 kc at 1700EST for the Michigan Buzzard Roost Net.
Anything will work as a antenna as long as one can load it and tune it and match it with the transmitter.
Trying to convince the Apt mgmt and maintenance here to allow me to utilize the 3 PVC vent pipes on top of the building as insulators and let me string a antenna wire between them. Its approx. 80 ft. Wud make a nice Windom or long wire.....At least the wire antenna then will be outside.
One must do what one must do to get on the air and get around all of the stupid-communistic antenna restrictions. There is always a way...... Sometimes it takes a lot of "farm boy" engineering!
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by N7RK on January 8, 2009
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I was in an apartment for 2.5 years in the mid 90's and was very successful with a hidden wire antenna thanks to some tall trees outside.
Here is a write-up of what I did
http://members.cox.net/n7rk/bigsig2.html
Dave N7RK
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RE: Building My Own Stealth Antenna
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by KB6QXM on January 14, 2009
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Mail this to a friend!
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What I do not understand is this. Anyone serious about the ham radio hobby, why would they desire to live in an apartment or on a postage stamp city lot with antenna restrictions?
I would believe that anyone serious about the hobby would try to find a rural QTH that they could put up a serious antenna system and not be concerned with limited performance antennas.
You know the old saying. If you have $10,000 to spend.
Spend $9,000 of it on an antenna system and $1,000 on the radio. Not the other way around.
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