Hum when cablevision is plugged in to tv

I called the cable company they are going to come out on the 3rd, hopefully they can ground it better or I will try some of your suggestions. Thanks very much Agon members for your help.

This question has come up numerous times. Here is a copy of my solution which I have posted before:

I had this same problem. Here are the two parts you need, total cost $11:

http://www.radioshack.com/product/index.jsp?productId=2103063&cp=&kw=300+ohm&kwCatId=2032057&parentPage=search

http://www.radioshack.com/product/index.jsp?productId=2062059&cp=&pg=1&kw=ohm&kwCatId=2032057&parentPage=search

Connect the cable coax wire to the transformer/splitter.
Connect the wires from the transformer/splitter to the 75-ohm coax combiner/splitter.
Connect the 75-ohm coax combiner/spltter to the input on your TV.
This was done for me by the cable TV guy. Worked like a charm. Why? I don't know. I guess it breaks the ground loop.

Ncarv I tried your suggestion and it worked! Thanks again for everyones help.

Glad to hear it, Romad.

This approach works to block the DC offset but it does not eliminate it. Get the cable company to fix the ground.

Kal