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WDHS real 8 isn't broadcasting presently, according to RabbitEars.info, and broadcasts very infrequently in order to keep their FCC license, according to wikipedia.org, so if it were me, I wouldn't worry about it. But if it ever does goes online for real, the signal is strong enough that it may be receivable off the back corner of the Y10713. It is/was broadcasting religious programming.
But I agree that using a preamp with separate UHF and VHF inputs should avoid the insertion losses associated with a UVSJ, small though they may be (.5dB is commonly claimed). But if you already have a single input amp, then a UVSJ is cheap enough to buy and try (even Radio Shack stocks them in their stores - don't confuse it with a common 2-way splitter), and you can return it if it's not going to work (cat. #15-2586). You can get them much cheaper elsewhere, but shipping and return policy may make the local store option more attractive. Put the UVSJ before the amplifier.
But I would try each antenna on its own, with the spread of the DB8e panels adjusted for max signal strength and quality across the channels of interest, as well as height and location on the building, then the Y10713, with no amplifier (take it and the power inserter out of the line) and a new RG6 cable (as short as you can use for testing purposes), then combine them and see if they still work well enough with the amplifier you have.
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