Another potential problem that can occur when close-stacking
a 2 el 40 is that the unused feedline dangling off the 40m
driven element can cause that element to become near-resonant on
one of the tribander bands. You can test for this by grounding/
ungrounding or shorting/unshorting the 40m feedline while observing
swr or f/b ratio on the tribander. If the swr or f/b changes,
you can change the length of the 40m feedline to make the problem
go away.
Dave Hachadorian, K6LL
San Diego, CA
K6LL@juno.com
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