Had Thunderstorms roll through early today and now I cant get the hum to go away from my cable, if I pull the feed from the wall it goes away, is this a box issue or something outside?
Somewhere in the cable system where the cable attaches to your home or just inside your home is a lightning arrestor. If you have not experienced the ground loop hum before I would bet it is inside your home. Do you have a basement? check there. When you find where it is, you should also see a bare ground wire attached to it. Break down the ground wire connection, clean, reinstall, and tighten back down. Also why you are there unscrew the coax male F connectors ends from the arrestor and look for corrosion. If they look ok reinstall and tighten with a wrench or pliers. Next thing to do is follow the bare ground wire that is connected to the lightning arrestor to its other end. Good chance you will find it connected to a cold water pipe with a ground clamp. Break down the connection clean with sand paper and reconnect and tighten. Post back with your results.