[TowerTalk] short mobile antenna matching

[K8RI]

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)