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If you can do so safely, placing the antenna above the nearby trees is the single best improvement available.
The ANT-751 is a compromise in size and gain, with the hope that it will not be too directional. It needs a clear view of the horizon.
The alternative is to opt for a larger antenna but that will force you to install a rotator to make the most use of it.
You need a stable signal from the antenna before applying an amplifier... the purpose of which is to overcome losses on the output side of the amplifier.
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