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I would use only one preamp, the CPA-19. It has better noise and overload performance.
ANT-751 connects to the VHF port of the UVSJ. The DB4e connects to the UHF port of the UVSJ. If the two antennas are not close to each other, the UVSJ would be best placed near the UHF antenna. The output of the UVSJ connects to the input of the CPA-19. The power insertion block can be close to the TV... but if you add a splitter that does not have power passing on any ports, you'll need to place the power insertion block between the preamp and splitter.
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