Trimming the trees is certainly worth doing. Moving foliage causes the passing signals to be reflected and attenuated which makes it hard for a TV tuner to maintain a lock on the signal. Added height is also worth trying.
An omni-directional antenna will receive both the direct path signal and reflected path signal if present. When this happens, the signals can cancel each other. This is referred to as multi-path interference. A Directional antenna tends to receive less of the reflected path signal and can help if you are having trouble with multi-path.
If you were starting from scratch, I'd suggest a directional antenna such as the Winegard HD7694P or Antennacraft HBU-33. The signals at your location are strong enough to make me a bit concerned that the AP-8700 could be overloading... which would make reception less reliable. The passive gain offered by the two antennas I've suggested would provide plenty of signal to drive up to six TVs. If the need for an amplifier was proven, I'd suggest a Channel Master CM-3410 just before the splitter.
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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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