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A lot will depend on what your walls are made of (plaster with metal lath indoors? brick outdoors? aluminum siding?), what sort of insulation you have (foil-backed fiberglas?), distance to the transmitter(s), houses in the way, trees, bushes; height above ground, etc. Heck, I have an amplified antenna on a 25 foot mast with a rotator, and because of all the trees, there are some DTV stations just 25 miles away that are now impossible to get. I'll have to wait until autumn and winter to be able to watch anything on CBS.
Basically, unless you have any DTV stations on VHF channels, a good regular UHF antenna is where you'd start. If you have a window where you'd be able to aim an antenna at the transmitter, with a minimum of obstructions, that would be a big help. Sensitivity of the DTV converter is also an issue.
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Tom
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