There is supposed to be a 75ohm Coax direct to the HF6V antenna; which then connects directly to a 52 ohm Coax connected to the transmitter/tuner. How long is this 75 ohm Coax? I would be interested in hearing from any person who actually successfuly substituted a better performing item instead of this 75ohm Coax. Eugene Rippen, WB6SZS