If you have this unit hooked up to your cable, there is a good chance that is where the ground loop occurs. You will need a ground isolation transformer that goes in line w the co-ax from your cable. It should have an F-connecter on each end (assuming you are in the U.S.) and can go anywhere it's convenient. There are inexpensive ones on Amazon that you can use to test it out. Then if it's effective, you can go up the food chain if you want.
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