I also have a problem with a "ground loop hum" since adding the 7500. It seems from many of the posts I've read, the Jensen Transformer has been successful in the case of those who have Cable systems. I have DirectTV and when I tried the Jensen Transformer (VRD-1FF) it simply cut off the signal altogether...obvioulsy not compatible with Satellite bandwidths. Any suggestions for a similar device that works with Satellite feeds?