Based on my past experience - I would be thinking an arc welder (or wire
or some such similar). If not that, then you might want to check for
carbon trails on HV insulators along the road (usually very effected by
the weather). As a third guess - and a worst case scenario - a serious
problem in your home electrical system (or a nearby neighbor).
You do need to eliminate the latter ASAP. Do you notice any changes in
line voltage when you experience this noise?
Bill W2BLC K-Line
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