There are two possible explaninations for what you are experiencing. Number one, would be a loose neutral connection at the weather head for the electrical service comming into your house. This loose neutral connection basically removes the 120V base line of the source coming into your house. Therefore, your appliances are possibly trying to operiate on anywhere from 0 to 240V. This is extreme, more like 90V to 150V. If this was the case you would normally experience a "hot" or "burning electronics" smell coming from your fridge, elec stove, etc. If so call your utility and tell them you have a loose neutral. They will know what your taling about.
Reason two is a little harder to expalain and track down. Radio iterference (RI) is caused electrical current arching thru the air. This can be caused by their an inside appliance or outside utility problem. To check it see if it is an inside problem, find an old battery operated radio and tune it to and AM stataion until you hear the noise. Then go to your home breaker panel and start shutting off one breaker at a time. If you turn off any breaker and the noise goes away, you have now found the bad circuit in you house. From there, turn the breaker back on and go to the area in your house that is feed by the circuit that cause the problem to go away. Again, listen for the noise on the AM raidio and start unplugging (not just turn off) appliances. If you unplug an appliance and noise goes away you have found your problem. Big culprits are fish tank heaters, door bell buzzer, floursent light ballast, and older washing machines. If none of this helps it is most liklely a utility problem. Has any utility work been done in your neighborhood as of late? Any lightning storms? In the case of utilites, they have a loose connection somewhere and is causing current to jump to a lower potential thru the air, thus causing RI. Don't expect them to do anything about it if you complain. It's a major pain in the ASS to track down, I would know! Normally the PSC hands this stuff over the the electric utility, but it can be caused by phone, cable, etc.
Hope this help. Sorry about the poor spelling, I'm headed off to my shoot leaque tonight and I'm in a hurry. But I do understand your frustration. Good luck.
Powereng