Yes, you can. Just google "digital converter box" and you'll find a slew of information on these. Here is just one site:
External ATSC Digital TV Set-Top Receivers
However, a couple of notes about your post:
First, you titled it "...HDTV tuner" - many of the converter boxes out there only output standard definition; if you want true high definition, make sure you get one that supports either 1080i or 720p (HD) output.
Second, you ask if you can watch "'without an antenna". You will need some sort of antenna, either a standard rabbit ears or something larger, depending on how close you are to the broadcast towers.
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