Chris Hoff of BPT thankfully hipped me to the video isolation transformer from Parts Express (part #180-075) and it eliminated the ground loop from my HT/stereo system. It was $10. You may need one for each of coaxial cables, ie. antenna, satellite, and cable.
Hum in preamp when using HT bypass
I have a Sim Audio P5 preamp that has an HT bypass input. AT first I was using RCA interconnects from CD to preamp, preamp to amp and the HT bypass and had no problems. When I switched to balanced from CD to preamp and preamp to amp leaving the RCA connection for the HT bypass I am getting the hum. There is no balanced input for the HT bypass. When I choose my CD input I do not get the hum, only when I switch to the HT bypass input. Any suggestions?