[Tigerbangs]

You have the wrong antenna: plain and simple: the CM-3010 is an urban antenna, and not meant for fringe areas: you need a fringe-area antenna: Since NYC has 3 VHF channels, you need an antenna that does both VHF high-band plus UHF. Good choices would be the Winegard HD-7696P, the AntennaCraft HBU-44, or, my deep-fringe prescription of a Winegard YA-1713 VHF high-band antenna plus an AntennasDirect XG91 UHF antenna combined using a Pico-Macom UVSJ, then run into your preamplifier. The last choice is more complicated, more expensive, but far more powerful than the other choices.

Your splitter needs to be mounted in the line AFTER the power supply for the preamplifier: if you mount it in the line between the preamp (on the roof) and the power supply (indoors), you risk blocking the power supply's DC power to the preamplifier that is necessary for the preamp to function.

if you choose to use the two-antenna solution, be sure that the antennas are mounted on the same mast separated by at least 4', with the UHF antenna mounted above the VHF antenna.

Please remember that a preamplifier is useful for recovering line and splitting losses incurred when conveying signals over a cable, but it does NOT make a digital signal a better signal, only a better antenna can do that.