Yes, any properly-aimed "conventional" outdoor antenna that tunes both VHF and UHF signals should also work for digital television; you might need to adjust the aim somewhat for optimal digital television reception, though. But I wouldn't adjust the aim much until after June 12, when the U.S. stations should be on their final channels.
By the way, don't expect "HDTV" quality on any U.S. channels except KGNS (8-1, NBC). Telemundo (8-3), CBS (13-1), and Fox (27-3) are all currently being broadcast in SD locally, even though all of these networks have national HD feeds. The picture quality will probably be better than analog, though.