A datasheet is a promise. A measurement is proof.
Typical performance is what a representative sample would produce in ideal conditions. Real antennas have real tolerances: small variations in machining, plating thickness and assembly that shift the curves by fractions of a dB.
Without measuring your specific unit, you don't know what you have. So we measure every antenna we ship — against the same calibration, in the same chamber, by the same team that designed it.

