I would consider this a wire vertical, I have used one many times. The
tower slightly changes the pattern, in my case it acts as a reflector.
The configuration that K9YC describes worked well for me, it was easy to
adjust and it has predictable results.
John KK9A
To: towertalk@contesting.com
Subject: Re: [TowerTalk] 160m Slopers
From: Jim Brown <jim@audiosystemsgroup.com>
Reply-to: jim@audiosystemsgroup.com
Date: Wed, 25 Jan 2017 20:13:34 -0800
><towertalk@contesting.com">mailto:towertalk@contesting.com>
>On Wed,1/25/2017 7:23 PM, john@kk9a.com wrote:
>This is a half sloper so the tower is a radiator.
Not necessarily -- it depends on how it is being fed. I have two wires
sloping off my 120 ft tower. They are insulated from the tower and fed
from the bottom against four radials elevated about 20 ft. I feed one or
the other, but not both. The tower, with a 3-el SteppIR and long 2M yagi
is long enough to act as a reflector, yielding about 6 dB of F/B. Because
the tower is part of the antenna, I have 8 quarter wave on-ground radials
on it.
This is, of course, not the only way to feed wires sloping off of a tower,
and some nice looking arrays are in the ARRL Handbook and/or Antenna Book.
73, Jim K9YC
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