HDTV antenna

I have the Zenith C34W23 34" widescreen HDTV. My crappy cable company hasn't produced a box that transmits HD signals yet, and my apartment situation makes satellite impossible (no view of the southern skyline). Can anyone recommend an HDTV antenna that I could run into the Zenith to get over-the-air HDTV? I live in the Washington, DC area (Bethesda, MD).

Thanks all,
Brian