Call Search
     

New to Ham Radio?
My Profile

Community
Articles
Forums
News
Reviews
Friends Remembered
Strays
Survey Question

Operating
Contesting
DX Cluster Spots
Propagation

Resources
Calendar
Classifieds
Ham Exams
Ham Links
List Archives
News Articles
Product Reviews
QSL Managers

Site Info
eHam Help (FAQ)
Support the site
The eHam Team
Advertising Info
Vision Statement
About eHam.net

   Home   Help Search  
Pages: Prev 1 [2]   Go Down
  Print  
Author Topic: 6" Or Shorter 2m Antenna?  (Read 8020 times)
K6LCS
Member

Posts: 1510


WWW

Ignore
« Reply #15 on: January 26, 2011, 04:31:20 PM »

On the hatch back - right above the taillight assembly - I'd use a quality hatch mount and a Comet SBB-5 antenna.

Diamond K400 mount
Comet SBB-5

Anything dramatically shorter  is a compromise in performance. The Phantoms are a joke for 2M. They are so bad that the original manufacturer LITERALLY INVENTED their own formula to derive their gain numbers - flying in the face of 50+ years of antenna theory. Law enforcement loves 'em - because their departments' systems are (typically/hopefully) very well designed (not needing gain), and the antennas go through car washed well.

Check out these two items. I haven't seen a better recommendation for hatchbacks in many years.

Clint Bradford, K6LCS
909-241-7666

Logged

Clint Bradford, K6LCS
http://www.k6lcs.com
K0BG
Member

Posts: 9860


WWW

Ignore
« Reply #16 on: January 26, 2011, 05:37:32 PM »

Here's something every one should read:

http://www.k0bg.com/images/pdf/mobile_vhf_ant.pdf

If that wasn't enough, here's another:

http://www.w8ji.com/VHF%20mobile%20vertical.htm
Logged

K6LCS
Member

Posts: 1510


WWW

Ignore
« Reply #17 on: January 26, 2011, 05:42:20 PM »

>> .. Here's something every one should read ...

Thanks for backing up my antenna suggestion (grin). With the setup I recommended, he'll have about 1/3 of the antenna above the roofline, and will have excellent performance from it.

Clint Bradford, K6LCS
http://www.clintbradford.com

Logged

Clint Bradford, K6LCS
http://www.k6lcs.com
WX7G
Member

Posts: 5954




Ignore
« Reply #18 on: January 26, 2011, 08:47:45 PM »

The MFJ-1721 ultralite mag mount antenna at $16 might do the job. It's 20" long but might bend enough to drive the Mazda into the garage.

Logged
K6LCS
Member

Posts: 1510


WWW

Ignore
« Reply #19 on: January 26, 2011, 09:49:03 PM »

A few items MFJ can be counted on. But in most - in my humble opinion as not only a consumer but also as a dealer - they offer CRAP to us. Clint Bradford K6LCS 909-241-7666
Logged

Clint Bradford, K6LCS
http://www.k6lcs.com
K2YO
Member

Posts: 436




Ignore
« Reply #20 on: January 26, 2011, 09:59:51 PM »

Laird makes a number of low profile antennas. You commonly see them on taxi cabs and buses.
http://lairdtech.thomasnet.com/viewitems/vehicular-mobile-radio-antennas/phantom-elite-antenna?&bc=100|3001622|3001654|3001655

Alot of EMS units have similar challenges with their antennas getting beat up. I'm seen a few in my neighborhood using these;
http://www.sti-co.com/antenna-products/public-safety-antennas/flexi-whip

I have not tried to use either of these, but I know they are in using in business applications.

Bernie
Logged
KI4SDY
Member

Posts: 1452




Ignore
« Reply #21 on: January 30, 2011, 08:04:01 AM »

Instead of drilling holes in your new car and or spending a lot of money on stealth mobile antennas with questionable performance, why not try this? Buy a MFJ 1721 2 meter magnetic mount antenna and stick it on the roof. The rod is very flexible will not sustain any damage from being bent over coming in and out of the garage. Performance will be very good for only $12.95!

We have used the dual band model on the lady ham's Mustang for years with great results. It is mounted on a narrow rear deck panel. It is very low profile and almost impossible to be seen from a distance. You could consider mounting it on the front fender deck of the Mazda, since there is no trunk. Because it is magnetic, you can move it around and try different locations for best performance versus clearance.

As a hint, after you get the antenna, keep in mind that the magnet is very powerful. Once it sticks you must tilt the antenna to remove it, which is difficult because of the small base. The magnet is so powerful that you can pull the bottom out of the antenna if you are not careful. I installed a round piece of auto scuff guard tape from Pep Boys on the magnet bottom to cut down on the power and prevent damage to the antenna when removed for washing and drying.

In consideration of your restrictions, for the money and performance wise, this is your best solution!  Grin
« Last Edit: January 30, 2011, 01:26:50 PM by KI4SDY » Logged
KQ6Q
Member

Posts: 968




Ignore
« Reply #22 on: February 06, 2011, 08:09:17 PM »

the VHF/UHF antenna does NOT have to be on the roof! I know your situation, I drive a Honda Element, and the clearance in the garage at work is 6 feet 6 "
I mount my antenna near the front of the hood opening, using a bracket the fastens to a bolt hole already present in the vehicle. I had to fabricate the bracket myself with a bit of metal strap (not plumber's tape, but the kind you get a home depot for house framing), and used the antenna mount/feed from Comet.
with a longish antenna (40" or so) for 2m/440, I was distracted by it whipping in turbulence at speed, so I keep the longer antenna inside in case I ever need it, and use one that's about 10" long. I hit all the repeaters I need to, and if I ever need a bigger antenna, I just mount the longer one.
My bracket is sort of Z-shaped, with 90 degree bends, formed to match the hood/fender opening. No scratches opening/closing the hood. No holes drilled (spouse request). coax to radio runs along the fender and through the door opening, unseen from outside the vehicle. Power cables from the battery take the same route.
In my vehicle, I removed a subwoofer (behind a grill under the dash/shifter) and had a perfect hidden spot for the radio CPU. You'll need to be creative in your vehicle - as the service manager at your dealer for suggestions.
Logged
K0XU
Member

Posts: 294




Ignore
« Reply #23 on: February 22, 2011, 01:27:28 PM »

I had a similar problem once with the parking ramp at work. I went with the inverted-L solution. Made for some interesting conversations though. Folks would ask me what kind of antenna I was using and when I said "an inverted-L" they would say "No, for 2 meters dummy".

Jim K0XU
Logged
Pages: Prev 1 [2]   Go Up
  Print  
 
Jump to:  

Powered by MySQL Powered by PHP Powered by SMF 1.1.11 | SMF © 2006-2009, Simple Machines LLC Valid XHTML 1.0! Valid CSS!