Sysiphus wrote:




Well, rain is an attenuator. Perhaps the signal you are looking for is
being attenuated by the rain, and, that attenuation plus the noise generated
by the power lines=lower SNR.

I see it all the time(not in SW bands, I am in Satellite
Communications[8GHz], but the theory has to be the same) Rain attenuates
desired signal, lowering C/Kt

At 8GH OK, but not at the frequencies generated by powerline arcing in
the HF spectrum.