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Install the preamplifier as close to the antenna as is practical. This helps maintain the quality of the signal.
As signal travels further down the coax from the antenna, it gets weaker... but the low level noise produced inside the TV tuner does not get lower. This will leave you with less difference between the signal and noise (Signal to Noise Ratio). If the SNR is to low, the tuner can not recover enough error free data to display picture and sound.
Amplifiers can not 'pull' signal from the coax or the antenna. Amplifiers only 'push' the signal through the coax and splitter that is attached to the output of the amplifier.
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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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