Take a look at QST page 45, June 1994 regarding an article by N4KG. In the
article there is the method to determine the effective loading of common
yagi antennas and tower attachement point. It may be of some help.
Les - KL7J
> From: Fatchett, Mike <Fatchett.Mike@tci.com>
> To: 'firstname.lastname@example.org'
> Subject: [TowerTalk] 1/2 sloper problems
> Date: Monday, July 28, 1997 8:55 AM
> I tried putting one up this weekend. Could not get a decent SWR
> anywhere. I tried adding length and subtracting length. Tried moving
> the point where it attaches to the tower from 70 feet to 78 feet. I did
> not try to move is lower. I tried changing the angle as well.
> Tower is 78 feet tall with a 40-2cd at 90 feet and a C3 at 80 feet.
> I started out with a 130 foot sloper.
> Anyone have any suggestions?
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