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I'm sorry, and it's nothing personal, but I strongly recommend that you go with the DB4-e for two reasons:
1) a bit more gain across the beamwidth. WTAJ has a noise margin of 20, and you want, for reliability's sake, a noise margin of 15 at the receiver after all the splitter and cable losses, and
2) the available VHF stations are analog only, so they will be going away soon. I see no applications in the FCC's databases for converting these to digital.
Preamps only serve to zero out cable and splitter losses, not to bring weak signals out of the noise. From your description, you won't have long enough cable runs for this to be an issue. You can always add a preamp later if you need to.
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