Unless you are in a extreme fringe area, 30 db gain preamps should be avoided.
Generally, lower gain preamps also have more resistance to overload.
With the massive amount of interference sources around these days, I first try to operate without a preamp first.
Preamps can't bring in signals that aren't there to begin with.
Their only purpose is to compensate for coax and splitter losses.
So keep your coax from the antenna as short as possible and you many times don't need a preamp
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