Thank you, Mike and Stoney...
I see... sure enough, tvfool lists some stations as having a yellow highlighting to it, indicating a need for VHF. Is there a HI-VHF-UHF antenna you might recommend then? I take it the pre-amp would only be used to get a steadier digital picture?
Right now, I had tried using the:
Channel Master 4220MHD 2-Bay HDTV
HDA-5700, Indoor/Outdoor from Monoprice (came with small, powered signal amplifier that screwed into the RG6)
Tried both indoors and up on the rooftop (single story, no tall buildings but some tall trees). Both yielded the "green" results from tvfool (the 2-3 aforementioned channels) but nothing more.