Look at the Boxee TV. It has an ATSC digital tuner and can connect to your projector via HDMI . It also has built in WIFI and an ethernet connection so can connect to the internet for apps such as Netflix, Hulu etc. Boxee sold itself to Samsung so no real support for the product and the cloud dvr capabilities at this time, but I only purchased mine for live TV viewing and Netflix to my projector. The unit comes with a small antenna, so if you are close to the broadcasters towers you may be able to use the small included antenna. I am too far away from the towers so have to use a larger arial antenna to pick up the broadcasters signals. You can also get Clear QAM channels if you hook to your cable provider and they offer clear qam channels via coaxial.
I am using it on my Optoma HD3300 projector with great success.
You can purchase Boxee TV at Walmart for 98.00. I hope this helps.