Jim:
Like Steve, I installed a 1/4 wave sloper wire for 80M off my Trylon 64-foot
tower (non-crankup) at around 50-55 feet. Atop the tower I have a Bencher
Skyhawk 10-element Yagi with the parasitic elements shorted to the boom with
aluminum straps and hose clamps. My RF radials consist of about 7 18AWG
insulated wires just below the grass, along with 125 feet or so of 2AWG wire
buried 2 feet and 12 copper ground rods arranged in radials off the tower legs
for lightning grounds.
I get great coverage up and down the US east coast, into the Canadian Maritime
Provinces and UK and western Europe. I also shunt feed the Trylon on 160M where
it works quite well for me.
Good luck with your project.
73 de Gene Smar AD3F
Sent from my Radio Shack TRS-80 model 100 laptop
On Tue, May 6, 2025 at 1:34 PM, Steve Lawrence via
Topband<topband@contesting.com> wrote: Jim - I used a 1/4 wave sloper for 80m
from the top of a 55ft 3 section crank up tower with a typical HF stack of
antennas.The coax shield was connected to the tower at that point. It worked
well +/- 90 degrees from the direction of the slope. I would not hesitate to
try the same on 160m.
The sloper is long gone in favor of shunt feeding the tower. I have no radials
either. No place for them. Just two copper ground rods at the tower base.
(There's an article on this in QST. See my QRZ page if you're interested.)
GL - Steve WB6RSE
> On May 6, 2025, at 9:15 AM, jim.thom jim.thom@telus.net <jim.thom@telus.net>
> wrote:
>
> Has anybody used a 1/4 wave sloper (for 160m, aprx 120-130') hanging from
> the top of a 89' crank up tower before ?
> Due to the 5 x sections overlapping, the feed point would have to be at the
> very top of the tower. IE: it can't be part way down from the top.
>
> Will it work with some top loading, like a 3 el 40m yagi ? Right now, my
> modified F12 340N yagi has all 3 x els insulated from the boom. ( oem LL
> wire loading replaced with hb 3/8" tubing coils). I was seriously
> thinking of bonding the REF and DIR to the boom, to increase the top
> loading. REF is aprx 59' long. DIR is aprx 52' long.
>
> I can't shunt feed the tower, since grnd mounted radials are out of the
> question. House is blocking the path of any radials > 180 degs.
>
> Jim VE7RF
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