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The DB8 (rather than the new DB8e) does not have adjustable panels. It has a narrow forward beam compared to the DB4 and DB4e. As such, I would not expect it to have the forward beam width needed to give you a good shot at simultaneous reception from the Detroit and local markets.
The DB4e has the advantage of being engineered to concentrate gain in the new UHF band (real CH-14 through CH-51). As a result, it has just 1.3 dB less gain than the older DB8 design... While having a significantly wider forward beam.
When sharing a mast, try for 4' of separation between the UHF and H-VHF antenna.
Yes, in this case, the preamp would connect to the combined output of the UVSJ. (In an extreme deep fringe situation, there may be a slight advantage to using separate preamps on each antenna... Then combining the outputs of the preamplifiers downstream of the power insertion blocks. It's rare to see that net enough improvement to justify the cost and complexity.)
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