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Just drop comcast completely,inless you use them for your internet. If you like netflix get a Ruku box for around 49 bucks. Oooooor use your pc or mac to watch all the tv you want! If you would still like to watch it on the tv all you need to do is connect your computer to your HD tv using an HDMI cord asumming you don't have one they go for about 7-10$.
Here are some websites I use to watch all the cool new shows that are out.
p.s you can even find live football games on the web fairly easy.
p.s.s Have you read the Dexter books?