When studying the frequency diagrams of TV antennas it is usually the case that it works good at lower UHF frequencies as it falls off very little in gain, but at higher frequencies above 700MHz TV band if falls of rapidly and cannot be used. It depends of the antenna.
I have had great success with TV UHF antennas and worked way better than any 1/4 or 5/8 UHF GP and even some VHF frequencies came in better than on a 1/4 GP VHF antenna. It will be mostly directive so the signals you want to receive needs to be in that direction.
/Ubbe