[Antennas] Re: Elevated Ground Plane Question

2002年10月09日 09:14:50 -0500

It is interesting that you see some commercial VHF and UHF antennas
installed that way with the radials and the feedpoint at the top. I suspect
that the applications for such an antenna are very few and a lot of
conditions have to be met before it is superior to a conventional ground
plane.
73/72, George 
Amateur Radio W5YR - the Yellow Rose of Texas
In the 57th year and it just keeps getting better!
Fairview, TX 30 mi NE of Dallas in Collin county EM13qe
K2 #489 Icom IC-765 #2349 Icom IC-756 PRO #2121
alexander eban wrote:
>> ...this is NOT top loading. A few years back MFJ put out what was called at
> the time ;Top Fed Antenna. The rationale behind it was that since the energy
> goes out at a slent angle from the radials and/or grounplane, feeding the
> antenna at the top and moving the ground plane at the top would result in
> radiation parallel to the ground. Actually it was shot into the ground! That
> antenna was never popular, probably because a lot of guys figured out
> something's fishy. The only good thing of that antenna was the size. I
> wouldn't recommend it, certainly not as a main antenna!
> 73 and all the best
> Alex 4Z5KS.