Three things you might want to check:
Crappy coax....water got in at the feedpoint.
Bugs and/or water in one of the traps. Water is a notorious culprit in the
A-3 traps. Rotate the boom 90 degrees one way and then the other...water may
flow out. After that, you can steam out the rest by putting a 100 watts
into it for a while. You can actually watch the SWR drop to the regular level
as it does.
See: http://www.mscomputer.com for "Self Supporting Towers", "Wireless Weather
Stations", and lot's more. Call Toll Free, 1-800-333-9041 with any questions
and ask for Sherman, W2FLA.
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