If a booster provides a maximum of 60 dB gain, then the boosted signal coming out of the unit is 60 dB stronger than the unboosted signal that went into the unit.  Gain represent the relative level of signal boost you are providing.  A booster with a higher gain value will in turn provide a higher boosted signal and will also enable a cell phone signal booster to cover a larger area than most lower gain units.  Our Signal Supervisor app helps you easily install your booster so you can make sure you are getting the most gain out of your install.