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^^ What he said.
Though if you are located in the US and you have Cable TV already I recommend their HDHomeRun Prime network tuner. I had one when I had Cable TV and it was awesome. It's got three TV tuners built in. The only down side is you'll have to get a CableCARD from the Cable Co, but they are cheap. Mine charged me $2.50 for it.
If you just want OTA stuff then the dual version that FnordMan recommended above will do the trick.