Reception issues can occur with any carrier. I suggest doing a search of the forums here, as this question has come up before, and you may find the posts useful.
Wilson repeaters have a good reputation (Google their website).
It seems that you've done the proper research to ensure that you're repeating the correct frequencies. Just ensure that you install the equipment per the directions from the manufacturer.
DMX 68' tower, HyGain HAM 5 rotator, Antennas Direct DB8e & C5, Channel Master 7777 preamp, Siemens surge protection