Thanks for the imput guys. This is what I have found so far. I have also run the gps on batteries as well as hard wired to the trike to eliminate it being a power source problem. With a dipole mounted and insulated on the kingpost instead of the hand held ariel mounted underneath the trike improved the situation somewhat and required less squelch but the static was still there. With the the dipole completely earthed to the trike, static gone. With the trike in the hangar and the wing down I can receive the weather station from the airport 5 kms away.
Cheers,
Bruce.