I picked up one of these RCA TVPRAMP1R for about 20$ shipped to my door. I set it up today in the attic with my Philips SDV4310/27 UHF antenna that I never had much luck with and had stored in the cellar. I am able to get all of the UHF stations that come up on the tvfool report at my house. The antenna advertises a 40 mile range and I was able to get a channel 50 miles from me. I like the amp because it has 2 inputs. One for vhf antenas and the other for UHF. Here are some features of the amp:

Designed specifically to improve the performance of outdoor antennas in low signal strength areas
Gain: VHF: 16 dB; UHF: 22 dB
Separate or combined inputs for UHF/VHF
Switchable FM trap reduces interference from FM frequencies
Separate amplification for UHF & VHF bands to improve performance