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