Digital Vs. Analog --
I got burned on this. A digital signal is still an analog signal. We live in an analog world. When the salesman says "You need a digital antenna!", he is most likely selling you a load.
The frequency that is being transmitted by television station for DTV are not the same as they used before, but they are still near the same band. The UHF frequencies ARE still the same band. It is the VHF frequencies that have been (are being?) sold for other purposes now.
Digital is just a great way of simplifying the transmission process. It takes a lot less discernment to "hear" the difference between "there" and "not there" than it does to hear the entire range of visual and audio.