[jyl]

Is it a mechanical effect or an electrical effect.

If mechanical, it wouldn't seem that terminating the overhead cable at a pole at the boundary of your yard then going underground, should cost too much. Presumably the pole can be located to make the underground run easy.

Or, even cheaper, could you sink a pole 2 feet from the corner of the house, run the cable to there, then have the cable be very slack for that last 2 feet to the house? The pole can vibrate all it wants.

If electrical, then I dunno but the steps James outlined don't seem too hard.