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Join Date: Oct 2006
Location: Wandering the intertubes, on the way to damnation
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You need a (digital) TV tuner. TVs have these built-in, as do cable boxes. The projector needs just a simple video signal (which is what it gets from a cable box Component or HDMI output for example), whereas antennas simply provide the multiple VHF/UHF-modulated OTA signals - something has to "tune" the station you want.
You can buy a separate tuner from Amazon, such as the "Samsung DTBH260F HDTV Terrestrial Receiver" for about $160. I suspect other models are available at varying prices.
Projectors are like monitors: they are just display devices, they do no RF manipulation for tuning channels.
Hope this helps,
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