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Pretty simple really, at least the way I understand antennas. An "omni directional" without an amplifier will have zero db gain as the signal will be relatively equal in all directions. A "directional" antenna will have an inherent gain in one direction, sometimes two directions (180 deg apart).
If the antenna cannot "pick up" the signal than the amplifier will amplify nothing. (simple math, 2db gain times zero = zero.)
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Marshall
2012 Laredo 303 TG
2010 F250 LT Super Cab, long bed, 4X4, 6.4 Turbo Diesel
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