Pete:

I am also flying a KC with P-160/4.9.......I do have a ham license and operate on 53 Mhz.....with a 955S RX amd 10X.....I use one of the German whips about 20.5 inches long, mounted about 2" behind the centerline of the canopy with 18.5" of antenna remaining on the RX end running horizontally inside the fuse.....everything is mounted per BV specs with the fuel pump and ECU on the right side of the plate and RX on the aft-left side of the plate with solenoids near the aft-middle of the plate....I use a 5 cell/2800maH RX pack with no regulator, and a Duralite pack in the 10X and on the ECU......

Range checks in excess of 300 ft in all four quadrants, TX antenna off, with engine running and plane sitting on the ground...

So far, 15 perfect flights.....

Tom