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Re: Topband: [Bulk] Best wire antenna for roof top location

To: <Topband@contesting.com>
Subject: Re: Topband: [Bulk] Best wire antenna for roof top location
From: "Tom W8JI" <w8ji@w8ji.com>
Reply-to: Tom W8JI <w8ji@w8ji.com>
Date: Sat, 8 Aug 2015 13:53:57 -0400
List-post: <topband@contesting.com">mailto:topband@contesting.com>

Some years ago, on 80 meters, an LZ station had a horizontal between two tall buildings and had a very strong signal.
73
Bruce-k1fz

Between buildings is entirely different than on a building roof.

Full context is important. As I said:

A simple vertical antenna has elevation pattern mostly determined by ground
several wavelengths from the antenna.

A simple horizontal antenna generally has elevation pattern mostly
determined by ground ********* immediately below******** the antenna up to a few wavelengths
out.

If the building has wiring and large connected metallic things ********under the horizontal antenna*********, it will act like a reflector. If the antenna is somewhat
low to the roof (less than 1/4 wave or more above the roof), the elevation
pattern won't be much different than a low dipole over flat earth. Most of
the radiation will be beamed straight up.


73 Tom



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