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Trees, even a single tree, can easily make the information in a reception prediction irrelevant. Though trees will reduce signal strength, that's quite often not the most significant problem. Moving tree limbs and foliage cause signals to fluctuate in strength. That makes the automatic gain control and equalizers in the tuner adjust to the changing conditions, and if the adjustments can't be made quickly enough, the tuner will loose lock on the incoming signal or possibly never achieve a lock. Simply going to a bigger antenna may not solve the problem in this scenario.
If you can get a clear shot at the northern horizon, I expect the DB4E to offer you all the UHF signals down to and including W27AU. To add reliable reception of real CH-7 & CH-9, a cut to band High-VHF antenna such as the Antennas Direct CS5 or Antennacraft Y5713 would do well. The two antenna can be combined reliably using a UHF/VHF signal combiner.
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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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