What is a signal booster's gain?

Gain is used to measure a booster's or antenna's output signal relative to its input signal. Gain is measured in decibels (dB).

If for example a booster has a maximum gain of 50 dB, the amplified signal coming out of the unit is up to 50 dB stronger than the signal that went into the booster.

Gain therefore represents the level of signal boost that a booster or antenna can provide. A booster with a higher gain will deliver a stronger signal and a larger coverage area than one with a lower gain.

Read answer to this question in more tech detail with diagram and video about how to measure signal strength.