This is a discussion on Cable Converter Box within the Converter Boxes and ATSC Tuners forums, part of the Over-the-Air (Antenna TV) category.
You do not need a converter box if you have your TV connected to Comcast Cable.
You can verify here: Get Ready for the Digital Transition with ComcastCurrent Comcast Customers
If all the TVs in your home are connected to Comcast, relax and we'll take care of the transition for you.
You may want to pick up a converter box anyway just for backup in case you ever cancel your cable service or have an extra TV not connected to your cable provider, but it's completely up to you.
If there comes a time that you do need a converter with Comcast cable, Comcast will contact you about it, and generally has been offering up to three boxes included in the package price you pay.
HTNut, thank you excatly what I needed to know.
Bicker thank you for letting me know that. I had gone to their website but was a bit confused and hadn't had time to call them. We are thinking about adding a few pay channels soon, depending on finances.