Try replacing the matching transformer.
http://www.amazon.com/WINEGARD-TV-29...ng+transformer
If that fails to provide a solution, consider stepping up to a larger antenna system that has both UHF and H-VHF capability.
A premium solution would be an Antennas Direct DB8e + Antennacraft Y10713 + RCA TVPRAMP1R.
There are smaller scale options to consider... But your experience with the ANT-751 suggests that you're fighting local terrain and/or vegetation and therefor the numbers on your TV Fool report may be optimistic.