[TowerTalk] 160m Slopers

[john at kk9a.com]

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 at contesting.com
Subject:	Re: [TowerTalk] 160m Slopers
From:	Jim Brown <jim at audiosystemsgroup.com>
Reply-to:	jim at audiosystemsgroup.com
Date:	Wed, 25 Jan 2017 20:13:34 -0800

><towertalk at contesting.com">mailto:towertalk at contesting.com>
>On Wed,1/25/2017 7:23 PM, john at 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