Gary,
Generally the closer to the arcing source the higher in Frequency
you will be able to hear it. From your descriptions I believe your
noise source may well be over a mile away. The lower frequencies
will propagate a long way on the power lines as antennas.
As you search around you should continue to check higher
frequencies for an indication you may be closer to the source.
I start on 160m or am bcb and work my way up to 225 MHz
or higher.
Lee K7TJR OR
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