not in Nashville, please add. My TV won't get it otherwise.
If by that, you mean that you can't pick it up with an antenna, then that probably means that there is no station in Nashville that carries it, in which case, Comcast can't do anything about it. It's not available separately to cable companies the way, say, CNN or ESPN are.
Then again, Circle says that Nashville broadcasts it on channel 4.5. You may need to do an antenna rescan on your TV first.