Ben - Thanks, but I had already done research on that:
http://www.solidsignal.com/HR10-250.asp
Per the above website:
"(2) Do I have to have an account with DIRECTV to receive "over-the-air" HD broadcasts?
Yes. The new HD Tivo DIRECTV DVR will not operate without a valid DIRECTV account on file with DIRECTV. "
Therefore, I assumed no direct TV subscription = no OTA HD capability.
Question #5 on the same website talks about just needing an antenna, but I assume they have a way of policing the fact that people like me would just buy the unit for OTA use.
Any other thoughts from anyone?