As said above, run a TV Fool report. With a TV Fool report, we can talk you thru the purchasing decisions.
Most people find indoor antennas to be less than great. For instance, brick exteriors block an awful lot of the broadcast signal.
FYI, anyone selling an 'HDTV' antenna is feeding you a lot of marketing hype. As long as an antenna works in both the UHF and VHF frequency ranges, then that antenna will work with new digital/ATSC broadcasts. Although there are some exceptions, almost all of the channels that you want will be in the range of channels 7 thru 51. When you get your TV Fool report, you need to pay particular attention to broadcasts on channels 7 thru 13 that you would hope to get, that will affect some purchasing decisions.