Yes, is was my audio they said was distorted. They were having trouble hearing me because of the distortion. I am running an Icom 7600 through an Icom PW-1 amp. My 80 meter dipole is hung between two tress about 75 feet high.
I was not having distortion on 15, 20 and 40 meter through my SteppIR antenna.
I'll bet that K6AER has the right approach. 1 KW of RF can put substantial voltages on your mic-to-rig cable. A balun at the antenna feedpoint, _and_ ferrites on both ends of the mic cable, should help.