For what it's worth, I hooked up the pre-amp again. It is on the mast about a foot below the antenna. I ran the coaxial downlead from the pre-amp to the grounding block and then into the house. Directly inside the house, it hooked into the power injector. The power supply was plugged in just below this and ran to power injector. The TV/tuner box was hooked directly into the power injector (removing the amplified splitter that I mentioned in my other post all together). After hooking all of this up, I got no signal on any station. With that in mind, this obviously isn't the correct way to set it up. I'm guessing it has everything to do with the coaxial down lead running to the grounding block first, then into the house. For reference,
here is a quick sketch of the setup I'm describing.