On 7/7/2013 11:38 PM, John King wrote:
I am mounting a KW40 11/10
meter antenna on the rear of my 40 ft. diesel pusher motor coach. In
case you are not familiar with the KW40 it is a center loaded short
antenna with a 3KW + rated coil by the manufacturer.
My Predator screwdriver, mounted on the front of the Coach, works very
well but the 3 inch diameter coil doesn't want to hit 10 meters, thus
the attempt to use the KW40 on the rear.
There is no satisfactory ground plane on a fiberglass coach which creates
matching problems especially for an antenna high up on the rear of the
coach . Our Coach is 13 feet tall because it has basement air
conditioning. The height of the short center loaded antenna suffers from being
so high with inadequate ground plane.
How about adding a counterpoise?
73
Roger (K8RI)
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