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1. A big one. The physical size of the element(s) determines the resonant frequency. Lower frequency signals generally requires that the antenna elements be proportionately larger.
2. It depends on if you need to merge VHF-LO with a VHF-HI/UHF signal or if you are merging VHF-LO/VHF-HI with UHF only. The first uses an HLSJ, the second uses a UVSJ.
3. Most consumer pre-amps are rated for 140F.
4. Maybe.
How are your high-VHF (real ch 7-13) channels?
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