Search

Title

Author

Article Body

Manager


Manager - AB7RG
Manager Notes

Indoor Attic Antennas -- Always Surprise Me!

Created by John Schriener Jr. N2LK on 2024-11-10

 

 

"Editor's Note: Due to the popularity of some of eHam's older articles, many of which you may not have read, the eHam.net team has decided to rerun some of the best articles that we have received since eHam's inception. These articles will be reprinted to add to the quality of eHam's content and in a show of appreciation to the authors of these articles." This article was originally published on: 10/11/2004

 

Indoor Attic Antennas -- Always Surprise Me!

 

I have been an active, albeit casual HAM for 15 years. By casual I mean I spend more time in the Fall/Winter DX'ing and Contesting then the rest of the year due to my sport fishing disease. I have confirmed 202 Countries, have DXCC (and on 3 bands, just need 8 more for 40 meters) and when my wife and kids let me, I can work hundreds of stations in many contests with stations worldwide on numerous modes.

 

In this time I have played with more wire antenna designs than you can imagine all with the limitation of no real trees or other supports available. The G5RV-Jr (52 foot flat-top) can be quite an effective radiator for 10-40 meters and I have used that and other commercial antenna's as well (Cushcraft R5 for example). All under less then ideal land conditions. They have been strung from my house to ground stakes, buried in tree's only 25 feet high and strung in attics, all bent back on themselves and curved to fit the small space available.

 

In all this fun of experimentation for us who cant have towers and big beams, I have come to a conclusion that although outside antenna's are nice, my attic dipoles do just as good a job, and don't pick up too much additional electrical noise to warrant me changing them. Now if I had 2-100ft. tall pine tree's on 2 acres of land I would have a full size Carolina Windom up there in a minute, but I don't and having an R5 in the backyard or stringing the shorty G5RV up 25 feet in the backyard does not improve over my attic fan dipole, much to my surprice once again this weekend.

 

I have a 15/20 meter coax fed fan dipole in the attic which performs well, in fact I took the R5 down since it was perhaps annoying to the neighbors, was a lightning hazard and did not do any better then my attic antenna. I took my G5RV from the attic and made a 25 ft. tall mast out of 2x4's last Fall, 03 and strung it in my backyard. Iworked alot but it never blew my ears away vs. when it was in my attic. I had the left over wire still in the attic for the G5RV, just soldered them to my existing dipole, and with my rig's tuner I had a 40 meter dipole (only 52 feet long and taking multiple bends in the attic). On top of that my HVAC is in the attic and that must add some nice lobes to my radiated patterns! During the CQWW RTTY this past weekend I worked stations throughout EU into Russia, Greece and SA as wel, all on 40 meters and 100 watts. I just keep getting surprised on how well these antenna's can be for working all the bands, not just 10-20 meters.

 

Bottom line if you live in a community where antennas are frowned upon (amazing such a thing could exist!) then don't give up hope on making solid DX QSO's. Use your attic and you will be just as surprised as me how effective they can be. Don't worry about wire being in straight lines, make what bends you have too to make the length of wire fit, use good coax, a balun and proper safety and you will work the world.

 

73

N2LK

 

W3ALG2024-12-08
Indoor Attic Antennas -- Always Surprise Me!
I live in an HOA. I've given 3 seminars on Attic Antennas over the years to different ham radio clubs. Opened up a LOT of eyes to the fact that attic antennas DO work!
I am fortunate to have a nice size attic. I have 3 antennas, Buckmaster 130ft 80-160meters, (runs the inside perimeter) G5RV 53ft (runs north-south) and a Diamond X50 (2m vertical) I have worked over 160 countries multiple times, over 4K QSO'S logged. I only run 100watts, no amplifier. I cannot reach into Japan Taiwan, ETC; but have heard stations there. I've worked a lot of unique stations throughout the world.
When starting out I had NO ONE to teach me anything about the hobby. I didn't know a diploe from a QSO?
so... I bought a Yaesu 857, threw a wire in the attic, not trimmed just cut it to 25ft, not knowing anything.... and the journey began. All I did was listen. Was not licensed at the time. I studied everything I could.

Don't let anyone tell you that an attic antenna does not work. This hobby is supposed to be fun! Have fun with it. Experiment and don't be afraid to try something. I had people in this hobby tell me that they don't understand how I was able to do this, it's not in the book? It goes against everything that shouldn't work. I'm not going to argue or question it, all I know is what worked for me.

Good luck, experiment and find out what works and have FUN!
G4GZG2024-12-05
Indoor Attic Antennas -- Always Surprise Me!
When I was first licenced here in the UK, I lived in a flat in London. I ran a random length loop around the shack room, which was on the first floor, just below the attic. Worked a ton of stations and some good DX in 1979, then moved on , got married, bought a house and had a variety of outdoor wire antennas over the years.

Fast forward to 2024, now retired and living in a Bungalow, I discovered my neighbours aren't as enamoured as I am at my antenna ideas so rediscovered the loop idea from 1979. Ran a 46 ft ( measured it this time) loop round the picture rail at a few metres above ground, although the house is 500ft ASL on a hill, so to an extent I am living at the top of a mast. In two weeks, I've worked most of the US, including the West Coast, JT1, D2 and XW, all with max 50W. I use a T match tuner and the loop tunes from 40M to 10M quite easily. I'm impressed and am now considering putting a W8JK in my attic.

KF0SKV2024-12-04
Indoor Attic Antennas -- Always Surprise Me!
New ham here too! I have an inverted VEE up in the attic, cut for 10 meters, could not be happier and very surprised with the performance. So far I have made a few overseas contacts and great stateside contacts with it. SWR clocks in right at 1:3 with a LDG 1:1 Balun to keep the impedance in check.

I just hung another VEE for 20 meters today. it seems to be receiving far better than the sloper. Can't transmit yet over 20, but soon will. Working on my General Ticket.
N4DBY2024-12-03
Indoor Attic Antennas -- Always Surprise Me!
As a new ham I was impatient to get on the air when we got our HF rig. My OM put up an attic dipole for me, which tuned well to 40m & 15M. He later added one for 20m and all three work amazingly well!

We have plenty of room for an outdoor rig, but I have found that I enjoy the challenge of testing my DX range, with the limitations that these antennas have. To date my furthest contact is almost 10,000 miles away, SSB! I have been pleasantly surprised by how much fun these antennas are!

KE0VT2024-12-03
Indoor Attic Antennas -- Always Surprise Me!
When I returned to ham radio in 2020 I knew I had to have an attic antenna. Mine is a Broad Banded Terminated
Dipole. 55' and swr at 1.6:1 or better with several bands
1:1. 6M is highest at 2.6:1 but my TS590-SG internal tuner handles it easily. In 2023 I added a KPA 500 and KAT 500. The main drawback is you lose 70% of your input power to the heating of the resistor. So, about 25 watts out initially but worked 5000 miles east, west and south. The linear makes it a little easier though the loss remains the same, 70% of input. I now have an OCF flagpole too. Our HOA has eased up on restrictions as a
board member is a ham. Maybe a beam is in the offing!
Don't sell the attic antenna short as it has very good ears, is relatively inexpensive, easy to install and works all bands from 6-160! The OCF handles the 500W available.
AF5CC2024-11-19
Indoor Attic Antennas -- Always Surprise Me!
Ran a couple of indoor dipoles in my apartment back in the early 90s when in grad school. Earned 6m VUCC with a 125 grid endorsement sticker. Earned DXCC using a 20 meter dipole I would also tune up on 17-10m. The coax run wasn't long do didn't have too bad of a loss. Even had a random wire snuck outside hooked to some metal grate on the underside of the overhang for the low bands. Sure had a lot of fun with that setup. Can't imaging what the noise floor would be like today in such a setting.

73 John AF5CC
N4OI2024-11-17
Indoor Attic Antennas -- Always Surprise Me!
Although the article is 20 years old, the physics and performance are still valid... My HOA covenants forced me into the attic where my modified AD DX-CC multi-band dipole is stretched about 60 feet in a straight line... The few feet extra wire hangs vertically from each end... An old Tentec 238 manual tuner makes my radios happy on all HF bands except 160 meters; even with 500 watts... Since I knew about the HOA restrictions before I built, I cannot complain and am continually grateful I can get on the air and run in the CWT sessions and even break some DX pileups... (Of course, CW is the way to go with a compromised antenna setup!)

73 ES GOD BLESS U ES URS DE KEN N4OI
dit dit
KC2JYD2024-11-17
Re: Indoor Attic Antennas -- Always Surprise Me!
Great article! Thanks for sharing.
Reply to a comment by : YI1TAT on 2024-11-11

thank you
YI1TAT2024-11-11
Indoor Attic Antennas -- Always Surprise Me!
thank you