This deal has ended.
If you have an HD TV and want to pick up all of the over-air HD network signals, this Zenith ZHDTV1 digital indoor antenna (I have one) is one of the most affordable options. The best deal is at Amazon, who just cut their price to $19.99. Most other stores are $28-$40 (I paid ~$30). Shipping is free if you spend $25 and there is no sales tax (except KS, ND, WA).