[TowerTalk] 160m Slopers

[Jim Brown]

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

> Whether it works well or
> not depends on the tower and other mounted antennas. I imagine that this is
> addressed in the Antenna Handbook. You would likely have better results
> shunt feeding the tower or using a wire vertical.
>
> John KK9A
>
> To:	towertalk at contesting.com
> Subject:	Re: [TowerTalk] 160m Slopers
> From:	jimlux <jimlux at earthlink.net>
> Date:	Wed, 25 Jan 2017 17:41:36 -0800
>
>> On 1/25/17 4:42 PM, Chuck Dietz W5PR wrote:
>> I have a 140' tower with several beams on it and I want to get back on
>> 160m.  I want to put up a 1/4 WL sloper, but my experience has been that it
>> will only barely cover 1/2 the band.  I have measured out two slopers, one
>> 133' long and the other 127' long. Can I feed both together with the same
>> feedline? (Adjusting the longer one first.)
> Yes, and both might need adjustment.. There's something in the Antenna Book
> about this kind of antenna. You also need to space the two wires apart a
> bit.
>
>
>
>
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