I have the DB36 with the dipole option at 91 ft, and an inverted V 80m dipole
with the feed point/ apex just below it at 89 feet. The end of the two legs of
the inverted v are at approximately 45ft above ground.
Yikes !
You almost certainly have severe interaction between the DB36 80 meter
dipole and your inverted-vee. Check this: Start with the DB36 boom at
right angles to the inverted-vee. Check the SWR. Now rotate the DB36
(without changing anything lengths on the DB36). Does the SWR change on
the 80 meter DB36 ?
73,
Steve, N2IC
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