I know I'm not the first one to observe this...
I have a KT36XA on one tower, and reference monobanders for 10, 15 and 20
on other towers. On 10 and 20, the XA always performs within a few dB of
the monobanders (sometimes, even better than the monobanders). On 15, the
XA is always down about 6 dB from the monobander. This is consistent
regardless of distance, direction, skip length, etc. Even the "band noise"
is down by this amount. The SWR on all 3 bands is reasonable. Long ago, I
also measured the resonant frequency of each element. See
http://www.kkn.net/~n2ic/kt36xa.xls . There is a 40 meter beam about 30
feet above it, but the 15 meter SWR does not change when either the XA or
40 is rotated, so I don't think there is significant interaction.
What did KLM/M2 do wrong on 15 ?
Before you tell me your KT36XA works great on 15, what are you comparing it
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