What's the likely cause of the 120 Hz (+harmonics) hum on WFAN's
signal, that's been there for a few months?

It's in the difference channel, between the upper and lower sidebands.
If you listen to both, you won't hear it. But listen to USB or LSB
alone and it's quite strong.

Some phase modulation of the carrier? An ancient stereo system
feeding in hum?
--
Ron Hardin


On the internet, nobody knows you're a jerk.