So the other day I was looking at some of the new HDTV's and came across all this hype about needing an HD antenna for free over-the-air broadcast. I thought to myself okay that's cool, but it just wasn't settling right. Later that day it hit me. You don't need a new antenna! The frequencies for UHF/VHF haven't changed, the only thing that has changed is how the information is sent on those frequencies and the bandwidth that is taken up by each station.
So to clear up the confusion here are a few links to info and such about antennas for digital TV:
Can I Use My UHF/VHF Antenna to Receive DTV?
Introduction to Over-The-Air Antennas
Digital Television (DTV)