At 12 miles you could be overloading the "high gain" amp.
I have stations from 11 to 40 miles, and need a modestly high gain (16 dB at peak) amp for my indoor (but second floor) antenna. Cheap
high gain ones overload badly due to the 11 mile station with
the antenna necessarily facing right at it. The 11 and 40 mile stations
are in the same line. I had to buy a GaAsFet preamp.
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