What is the purpose of the series capacitor in a gamma match?

A gamma match is constructed using a metal rod placed parallel to the antenna's driven element, which physically resembles a short, unbalanced transmission line. Because of its physical layout, this parallel rod inherently introduces a significant amount of inductive reactance to the feed point. To achieve a perfect 1:1 SWR, the antenna system must present a purely resistive load to the transmitter. The series capacitor in the gamma match is added specifically to provide capacitive reactance, which directly cancels out the unwanted inductive reactance created by the matching rod. While series capacitors are often used in general electronics for DC isolation or filtering harmonics, those are distractors here. In the context of antenna matching networks, the capacitor's job is purely about balancing reactive components.