Ted,
The SWR at your radio is a function of the antenna AND the feed line. Don't
assume the antenna is the problem. If you can measure the antenna at a
known half wavelength transmission line point, you will know for certainty
if the issue is "at the antenna" (which could also include the connection to
the antenna).
I now make it a practice to have a known tap point on the ground for all of
my tower mounted antennas.
My experience with trapped dipoles is that if the trap goes - the matched
SWR point shifts way more than 300khz on a 40M antenna.
Ed N1UR
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