Having read the threads, I agree with the strong BC signal interference
and also the feed line needs to be checked. On expedition relied on a hand
held antenna bridge without checking their coax feedline and concluded their
80/160 meter antenna had crapped out when, in fact, they had a bad
connection or connector. They, again, were in a strong AM broadcast area
and could not understand the overload from the local stations.
A General Rado Bridge is the best way to truly find out what the antenna
impedance is at various frequencies. Trial and error using low power from
your ham station radio is another possibility, but one generally does not
get the complete picture that way!
Good Luck 73 George K8GG
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