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you do not want Positive power numbers you WANT negative Negative means that the isp is not needing to push more power to get the signal to the modem +8 while not great is ok I like to see between -7 - +7 but the spec says -10 to +10 a booster throws that reading off anyway so its all moot unless you have lineman tools I suspect the reason you saw a improvement was simply a bad connection because 90% of the time AMP's don't do anything but make it worse
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