I may have sounded as if I was speaking against the preamp in general. Please be assured that I'm agreeing with your application, overcoming cable loss.
It's been my observation that amplifiers are often erroneously expected to act as a substitute for the correct antenna and its installation.
WDIV (real CH-45) may be having trouble due to adjacent channel interference from WUPW (real CH-46). If that's true, a more directional antenna might solve the problem.
WXYZ (real CH-41) has no such issue but is distant and below your horizon. Antenna elevation / location would be a next step to try.
Regardless, the DB4e is a far superior choice of antenna for going after the distant Detroit signals. The HD7000 would not have the UHF gain needed.
It sounds like you've done better than most folks in a landlord/tenant relationship.
Thanks for the reports.
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If the well is dry and you don't see rain on the horizon, you'll need to dig the hole deeper. (If the antenna can't get the job done, an amp won't fix it.)
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