Ok, I can sympathise with this...
I had a C.B. antenna, (30 foot job), on a 50 foot tower. And for the longest time, I was getting some type of interference... humming, buzzing static that eventually blew out my new curtis mathis tv (And of course, this is when they WENT OUT OF BUSINESS! hmmm conspiracy if you ask me!)...
It also affected my radios (Ham, CB, AM/FM)...
I was getting feed back from the air, into the antenna and tower..(even had a ground system in). So, I took the antenna down.... Still feed back.
I took the tower down... Cut it down a whole lot, but a little left.
I found realized later that I grounded the electrical system to my water pipes, and that didnt do any good, so, I put a better ground in, and that solved the entire problem... Oh, yea, they DID replace the faulty transformer outside my house after that too... hmmm
It drove me nuts for 5 months, thought it was thermostat noise, or dirty electric (spikes in power)... So, I sympathise with you because it can drive you batty....
Jesse