I don't get great OTA signal strength (high 60s on ABC, low 80s on NBC/FOX) but I would say that the tuner keeps a good lock on the stations with only occassional multi-path artifacts, normally just when the helicopters fly by. My TV's tuner wasn't nearly as good.
TiVo HD, 86/810 hours, Lifetime.
Humax T800 Series 2 TiVo, 80 hours, MSD.
Xbox Live Gamertag: aus1ander