I use an addon TV Tuner card. It's not a TV-out card. TV-out means there's an output for your computer to connect to your TV or home theatre so it's the opposite of what you need.
You need a TV-in card, something with a TV-tuner so that it can get cable channels. I personally use an addon card that is PCI, as I find that with all in one solutions (albeit the all-in-wonders are amazing) mean you have less choice if you need to upgrade.
I did once have the cable split off from my cable modem to try it out in another room once and it worked but I just use the jack that's in this part of my house normally as part of my cable plan.
Something that might be cheaper is some sort of a capture card, I wish these were more abundant, some sort of card that only had RCA inputs. Then you could just take an old VCR and use it as the TV-Tuner and remote and connect the VCR to your computer to do all the work and save you money.
Right now infact, I do have a VCR connected to my TV in because it also helps me in converting old videotapes to digital format but the quality of the connection isn't so great.
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