ok thanks all that sent answers. Let me go over this again. Originally
it came with rg58 single length piece of coax 80 1/4 in total length
with 78 in of shield total. each end of the coax is attached to the
driven elements.... one on each side... and the shields go to the boom.
A beta match tube with shorting bars also attaches to the driven element
on each side. according to the manual to use with high power just
subsitute rg213 same dimension as the 58 and it should be ready. I used
a piece of RG8 with solid dielectric cut the same. I have a hard time
believing that this could shift the resonant frequency by 1.5 mhz. the
manual doesn't say anything about it being 4:1 balun it's just a
matching line, i would guess. Also I have interaction with the 7 el 10
ft above it; when the two are aligned in the same direction, the swr on
the 7 el also jumps to 2:1... go figure! Cort
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