40 and 80? They probably have a imported plasma TV with zero shielding. They throw out enough RF to give the viewer a tan.
One thing I left out of my post on this topic quite accidentally is that the home has changed owners over the past 8 years. I don't think it's something specific that either owner has "plugged in" but there's definitely something in that house that's causing a buttload of interference. Would love to have the local power company get there and inspect the electrical service and see if that's what's causing it, but neighbor not open to that for some reason.
Of course, the FCC has been no help.