Dennis, I've had decent results with a Comet GP15 (triband 6/2/440) vertical. Mine is tuned to 52.525 but I found that it would tune (1.7:1) on 50.125 by adjusting the 6m radial all the way out. It's the only 6m vertical I've ever used so I don't have anything to compare it to. Doug Huchteman KD5VHZ EM15 6MT # 2124 SMIRK # 6556