Well, I'd also conclude that you have a ground loop problem -- which is certainly not unusual with cable boxes. I had this same problem, as has my son. The problem in my system and my son's system were both solved by installing a ground loop isolator, which you can get at Radio Shack for around $20. Try getting a ground loop isolator, and if it doesn't cure your problem you can take it back to Rat Shack for a refund.
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