See thread at http://www.eham.net/ehamforum/smf/index.php/topic,80914.0.html
A technician came to neighbor next house to replace a TV cable (Charter) because of complains about reception. After the repair, the noise is gone.
My 160m triangular array indicated the right direction. However, readings with a beam on higher bands were inconsistent, and an AM radio next to the house did not indicate anything special.