Any other antennas around? I have a KT-36XA 9 feet above my 40-2CD on a
separate rotator. When the Boom of the XA is parallel to the elements of the
40-2CD ( 90 degree firning direction offset) I see a SWR rise (on the 40-2CD)
such as you describe. My theory is that the XA boom is close enough to
resonance on 40 to detune the 40-2CD. When they are in-line (firing directions)
the SWR returns to normal.
-Tony, K1KP
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