Hi Rich, I"m using the 2 element 10-15-20 model that also loads on 6, although I've never run it on 6. For me the factory settings were fine on 20 and 10, but had to make a small adjustment on 15 to lower the resonant point a bit. Perhaps the fact that my height of 23 feet is close to a half wave on 15 made some difference, but it was resonant around21.4 and I had to lower it. The push up mast is just a Radio Shack 19 footer. 6 guy points attached at 2 places on the mast and guyed with 1/4 dacron rope rated around 750 lbs. The bottom of the mast sits in a pipe that gets the mast about 2 1/2 feet above ground level. Hope to play some this weekend in the 10 meter contest. 73 Steve KW3A