I have a 706 MK2 in my motorhome with a Tar Heal antenna mounted to the ladder rack. While the radio does work I find that I am not able to make many contacts. I suspect that since the body is all fiberglass there is no ground plane to reflect from. I have run braded copper strap from the antenna mount directly to the motor home frame and it didn't seem to help. Any suggestions or has anyone else found a suitable way to operate HF from a fiberglass motorhome?