Back to the original poster HSDANCER, Cliff. Read most of this long thread again and either I missed it or you didn't say if you live in a rural area or someplace with close neighbors. Like LA where neighbors can be feet away. If you're very rural it should be pretty easy to isolate the problem because power poles are more widely spaced and once you come off the transformer it's only your house involved. If you have close neighbors it could be a problem on one of their properties. Of course then you have the added complexity of transformer sharing, neighborhood phone lines, cable TV, water and sewer pipes etc. Wish there was an easy button.
Al