Topband: Quarter wave sloper on crank up tower ?

jim.thom jim.thom@telus.net jim.thom at telus.net
Tue May 6 12:15:39 EDT 2025


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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