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If you have a scope with high bandwidth (> 100MHz), you could measure the AC voltage into and out of the amp, to see if the antenna signal is being amplified to the spec of the preamp. Or you could use a tuner or TV that has a signal strength meter, and see what the strength is with and without the preamp. 20 dB will be a 10x voltage gain.
Attic installations are always something of a crapshoot.
Last edited by timgr; 29-Oct-2014 at 2:19 PM.
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