OK, on my property, which is definitely not "rural electrification," I am subject to this single-wire earth return (inducing hum into the audio I listen to).

One thing I note, if I place voltmeter probes in the dirt of my yard twenty or thirty feet apart and in parallel with the power wires on the street, I see a significant voltage on the voltmeter. Single digit voltage.

Can I take advantage of that earth return? Maybe to charge batteries?