RnR-do you have any cable TV gear plugged into any of the audio, including the video monitor, or a digital connection between a cable box and receiver? Cable is notorious for introducing 60 hz hum.
No cable hooked up MacGeek, but there was that Verizon Fios box that I have since removed.
I am going to do some more testing this week. I have removed the Direct TV dish, all associated wiring, Verizon Fios box/panel and it's wiring, and also purchased a Tripp-Lite noise suppressor. If the problem still persists, I'm going to have to consider some other options. I'll report back after some proper testing.. Thank you