You could always just buy a TV tuner card for the PC; unfortunately that wouldn't be high definition. There are HDTV PCI cards available, but they range from around 80 base (over-air receiver) price to even 300 bucks, so it may be in your best interest financially to just get a box receiver.
oldmn, you'd be right if this were a normal TV, but LCDs actually use a DVI input, which is supported by many digital receivers nowadays.
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