Topband: Elevated ground planes

[Milt Jensen, N5IA]

Hi Bill,

That was/is exactly the case and what has been done at my QTH since the
November weekend of 1995.  Prior to that I had shunt fed my 120' Rohn 25
tower.  I have my home with a 65' high mulberry tree alongside, together
with other neighboring trees that obsured nearly 50% of my tower.

I simply jacked the tower in two at the 65' level, inserted a homemade
insulated section, extended the tower to a full 1/4 WL above the insulated
section, added four 1/4 WL caged radials going out to the top of 55' wooden
poles (visualize a simple 1/4 WL 2 Meter GP enlarged 80 times), matched up
the 32 Ohm feedpoint and I had an instant winner.

Try it.  You will like it.  73 de Milt, N5IA

----- Original Message ----- 
From: <Cqtestk4xs at aol.com>
To: <topband at contesting.com>
Sent: Sunday, October 24, 2004 7:04 PM
Subject: Topband: Elevated ground planes


> Something to think about....
>
> Suppose we have a location which is surrounded by trees perhaps around
fifty
> feet tall.  Since verticals are affected according to ON4UN by
obstructions to
> some degree, wouldn't a 1/4 wavelength vertical with a ground plane at
around
> 50 or 60 feet probably be a better performer (assuming it has maybe 12 1/4
> wavelength radials) than a ground mounted one with maybe 30 or 40 radials
of the
> same size?  Is it a correct assumption for 160?
>
> Bill K4XS
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