Highly recommend buying a digital filter for your Cable wire leading into your cable box. Make sure you get one that's male female so you can just avoid using another wire. You can get them for about 10 to 20 bucks on Amazon. There was a recommendation made earlier for $75 isolator but that was crazy. @jetter .
Maybe the recommendation was for a really great isolator but the one I bought solved 90% of the problem. And my cable wiring to my house is grounded. Another problem I had was I have a tube amplifier and that inherently picked up a lot of hum versus solid state when I had one which had no hum.
You could always just buy a dog and forget about everything else.