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Thanks for the details.
So, 138' of RG-6 will have about 9 dB of loss at the upper end of the UHF band. (Assuming 6.5 dB loss per 100')
The AP8725 is rated at 28 dB gain (UHF). The HDA-100 is rated at 15 dB gain. Both amplifiers are rated at about 3 dB NF which means that even if the HDA-100 is not overloaded by the preamplifier the combined noise figure of the two amplifiers is about 6 dB. The NF of each amplifier is a negative, a source of noise added to the signal.
I'd like to suggest an experiment.
Try connecting a single TV to the output of the AP8725. (I'm thinking that it may be easy to disconnect the cable from the input of the HDA-100 and connect that cable to a TV.)
My suspicion is that the new antenna and coax repair is delivering more signal to the HDA-100, overloading it to some degree. I'm also thinking the AP8725 is possibly over-driven... but I don't want to make you lower the tower unless we prove the need.
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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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