From Warrensburg, a long-range UHF-only antenna with a pre-amp should get you all the Kansas City stations. If you want the PBS station out of Sedalia or any of the Columbia/Jeff City stations, you'll have to plan separately for that.
Projectors generally don't have any tuner in them. The HDHR is a network-based tuner and is generally for use via a PC, laptop, or an HTPC. If you're computer savvy (and it sounds like you are) the HDHR/HTPC combo sounds like a good solution.
Cheers!
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