Hum issue - driving me more crazy

Mnorl: I also have a ground loop hum that I have traced to my Directv dish; but only on my main system; the bedroom system using an Integra receiver has no hum...I've checked and made sure the dish is grounded properly; and have used some cheater plugs; but still have hum....hummm...how to fix that I wonder? ideas? Knowing which piece is causing the hum; then fixing it are two different sides to the same puzzle...thanks.

Jea; I had electrician come out to house and attach dedicated ground wire to a grounded piece of metal on house; ie; electrical conduit. I did try to put a piece of steel rod in the ground to a depth of 5', and attach copper grounding wire; but that proved a bit problematic. What ideas do you have about properly grounding a sat dish? how come my bedroom sat system has no ground hum; only my more sensitive main listening area when I switched out my Meridian 861 processor for a Marantz 7005 processor;(no hum before with same sat box and connections) and added a VAC tubed preamp. System stone quite in 2 channel listening mode; only hums when Marantz is powered up; and attached to Directv dish; take away the hdmi cable from sat dish to marantz; no hum...hummmm; any help would be appreciated. Added a ARTcessary DTI (dual transformed isolator) running as rca plugs instead of balanced to connect Marantz to VAC for front channel for home theater rig; and made a big reduction in the hum; so at least is only mildly anoying, but not eliminated.bought from MCM electronics catelogue...
I would appreciate any and all helpful tips on this problem...sure others have similiar issues with Directv dishes; since the Jensen product works by eliminating the hum; but if fails to allow the video/audio signals to be sent thru as well....