Yep, same here - drops off quite a bit as frequency goes up, unfortunately. I've been meaning to play around with toroid wire spacing to see if I can get an improvement but in the mean time I've gone back to my mid-band QMX where I've got nearly solid 4-5 watts on all six bands. :-)
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Jim / K7TXA
Eagle, ID
SKCC 10447T
BUG 301