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no loss in combiner and phasing harness for the DB8e - how far from reality is that assumption?
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Not very far, the combining is pretty efficient.
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with the Y10-7-13 over the DB8e?
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Put whichever one provides the best results on top. Traditionally, the UHF antenna gets put on top, but that's never set in stone.
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I would probably try manually rotating the mast
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That's a good compromise to see what's possible. Keep in mind that big antennas are going to need a very robust rotor.
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Any reason to consider maybe a PA-18 amplifier instead of the CPA-19 I already have?
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Not really since you already have the CPA19. The PA18's noise figure would give you less than a dB of advantage in system noise figure so I'd suggest sticking with the CPA19 for your initial tests.
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Is there a better recommendation for a low noise amplifier with independent UHF and VHF inputs?
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Antennacraft and RCA are your only current model choices. You might find a discontinued Winegard or Channel Master on ebay if you're patient enough to wait for one to come along. In reality, using an external UVSJ of good quality with a low noise single input pre-amp usually won't make much of a difference in the system noise figures.
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does it make any sense to use my Motorola BDA-100S4 as an amplified splitter
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Only if it's needed. Let's get some reception first before expanding the system.