Thread: When a preamp is needed and cable length
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Old 8-Jul-2014, 8:45 PM   #6
ADTech
Antennas Direct Tech Supp
 
Join Date: Jan 2010
Posts: 2,942
Informel is correct.

An UN-powered amplifier usually behaves like a ~30 dB attenuator. Only those signals that, at the antenna's terminals, has ~30 dB more power than the bare minimum, will make it through the dead amp and be received by the TV set.
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