HD Beat posted a great article about Over-The-Air HDTV signals, including how to get started. I know many people aren't familiar with OTA HDTV yet, so this is worth a read, especially since OTA HDTV signals are free, and usually are much better quality than the compressed HDTV feed your cable company provides you. It also links to some very useful sites such as AntennaWeb.org.
Read the article
Read the article