The CM-7777 preamp will WIPE out your signal if you have more than 1 real strong station. It overloads very easy, as it's for extreme far-fringe use. Also, not all splitters pass power. So if your 7777 power injector is on the wrong side of the splitter, your 7777 preamp is not getting power, and is now a 30db ATTENUATOR. Try without it, and going straight to your Tivo. Report back if your signal levels are better. If that antenna is inside your house, that will also cut way down on your signal.