So I had DTV installed this past weekend and in my home theater I am getting a low hum when my Directv DVR is hooked up to my Yamaha reciever. I have hooked it up in various other inputs including directly to the TV and i still get a hum through my speakers. Is this a grounding issue with the Satellite dish? I noticed the guy ground the dish to the base that the dish mounts too. Any help would be appreciated.