Wilson sleek

But db is still probably a better way to determine if the Amp is doing its job. Also remember db is not linear it is logarithmic so an increase in 1db is not a 1% increase, it can actually be a big improvement.

yes it is

3db on the meter is a doubling of the signal level, aka a 100% increase over the previous signal

so if the antenna signal was (1) MicroVolt of induced signal
3db increase would be (2) Microvolt of induced signal

if the signal increased by 6 db it would be (4) Microvolt of induced signal

the most important 'ACTION' of Any amplifier is not the receive function
its the increased output transmit function, the stronger signal being sent to the tower

you can show a one bar signal on the phone and not make a call, why ?
because the 'tower' can't detect your phone, even though the phone can detect the tower, the phone signal is not strong enough to 'alert' the tower, which has stronger signal traffic coming in and may be a busy tower