There are plenty of threads here on antennas and amplifiers to use. I'm using a cheap ($3) RS Yagi type with their most powerful preamp and a rotor, and get KUAT at atleast 40% (which is enough, apparently) here on the west side of town, near the Tucson Mtns. If I have any trouble in the far distant future (when KOLD and the rest finally goes live), I may consider the CM 4228 8-bay UHF bowtie array and maybe the CM7777 or similar UHF preamp.
For now, it looks like the only hope for HD may be to switch from Comcast to COX come June, or just succumb to the never-ending delays and go with DISH and sell my MyHD card. Problem with all this is that I have broadband with Comcast at the moment.