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My experience with HDHR tuners has been that 'Signal Quality' is the most telling statistic. Any value under 50% is usually inadequate, and you'll not likely see any reliable reception. The minimum goal is a stable 'Signal Quality' value of at least 60%. Values that are usually high but prone to fluctuation will generally be prone to unreliable periods of reception.
A stable high quality signal is not achieved through amplification. Amplification will increase both the desired and undesired RF levels... And add a bit of noise and distortion created in the active electronics of the amp... The net result is often a high-strength-low-quality signal.
I'd suggest you try adjusting the antenna aim, height and location in deliberate steps, looking for an acceptable quality signal. If practical, the HDHR tuner could be place at the antenna during the adjustments... With the amplifier and it's power supply completely disconnected. You'll be seeing the actual signal right off the antenna... Until you have a reliable signal there, there's no point in amplifying anything.
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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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