Topband: EZnec - 4nec2 - MODELING THE 1/4 SLOPERS.

Jim Brown jim at
Sat Mar 8 13:38:16 EST 2014

On 3/8/2014 9:08 AM, Herb Schoenbohm wrote:
> IMHO a wire 1/4 wave length long wire should preferably be 
> electrically connected to the tower and fed from the bottom of the 
> slope against a good ground system. 


That depends on the height of the tower. I have two sloping wires on 
opposite sides of my 110 ft tower (with SteppIR and 2M long Yagi on top) 
that are INSULATED from the tower and each fed from the bottom against 
four radials elevated about 20 ft. The tower is grounded and has a dozen 
or so quarter wave radials. The wires are held 5 ft away from the tower 
at the top by a 10 ft section of 4-in PVC conduit. One faces to 70 
degrees, the other to 270 degrees. NEC predicts the same gain of 2-3 dB 
with F/B of about 6 dB, and that's about the way they hear. I feed one 
or the other, with a stub in the shack that opens the feed of the 
antenna not being driven.

73, Jim K9YC

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