I'm having good luck using cable-TV grade RG6/U even though it 75 ohm. The radios don't seem to notice the "mismatch" at all. My longest run is from my Beverage antenna, the feed being around 150 feet or so. 73, J.B., VE3EAR LowFER Beacon "EAR" 188.830 kHz. QRSS30 EN93dr