On Oct 30, 6:50*am, Dave WB4IUY wrote:
I realize there will be some coupling to the tower, but don't have any
way (or know how) to model this.

EZNEC will do that. A quick look says that it will work just fine.
There's not much difference in feeding the tower and feeding a wire
parallel to the tower.
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73, Cecil, w5dxp.com