On Jan 16, 9:56*pm, John Smith wrote:
On 1/16/2011 9:41 PM, bpnjensen wrote:

* ...

Do you have above ground power in your area?

Is it possible you are in an area where a "ground loop" is occurring?
How often are the poles grounded? *I have seen every pole grounded and
some installations where only 1 out of five poles are grounded ... this
can result in noise ... indeed, tremendous currents can circulate though
the ground ...

Regards,
JS

Good question. I would not be a bit surprised. We have 1950's era
aerial power.