I actually have one of those cheapo TV wonder cards in my PC, and Dish Network.
You can't have the PC change your channels or take the place of your satellite receiver, as mentioned above.
I set the ATI tuner to channel 3, and use one of those wireless video senders (I got mine for about $20 on eBay) to send audio/video from one of my receivers to the computer. It's not perfect, but it works fairly well. You just have to manually change the channels on the receiver.
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