Did you put in e.g. a 10 dB pad and verify that the noise drops (only) 10 dB?
Given what you said, I would not expect otherwise, but a good test to
do.
Have you tried to look over much wider bandwidths, like the whole 2m
band, or a bit more, to look for patterns in frequency?
Have you gone near the tower with a spectrum analyzer?
Any other 2m weak signal types nearby that could do a sweep in azimuth
and report to you?
73 de n1dam
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