I think I may file a complaint with the FCC just to see what they will do, maybe they will get Heil to tell my what kind of "filter". They have been such butts about this.
Yeah, just tell 'em to "go to Heil".
I think one of the reasons so much consumer crap radiates garbage these days is that no-one listens to AM radio any more, except for maybe a few Rush Limpballs fans, and nearly everyone has cable TV.
I recently had a severe power line noise problem, and found the source about two miles away. I knocked on a few doors in the vicinity, and found maybe a half dozen people home. I asked them if they had been experiencing any radio or TV interference and let them listen to the portable radio I had with me. The local AM BC station 8 miles away was nearly covered up by the sizzle.
Every single person I talked to told me no, they hadn't been aware of any problem, even though they were living right underneath the noise source.
A generation or two ago when most of the radio the public listened to was AM, and TV was picked up from a station 50 miles away with a rooftop antenna, this electromagnetic pollution would not have been tolerated.
If and whenever the great change-over to digital TV finally occurs, the situation will only get worse.