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Yes as in the past , Test reception buy aiming the antenna in the other direction to receive a reflected signal.
Perhaps you can find some old timers , that did it in the past.
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As to the antenna gain and the amplifier gain adding to the antenna gain.
Pay close attention to the wording of the statement.
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I recommend Test reception , with a preamplifier and without a preamplifier.
When Testing reception without the preamplifier , all parts of the preamplifier must be Disconnected and Removed.
Disconnect and Remove the preamplifier unit , Disconnect and Remove the power injector , Disconnect and Remove the power supply.
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