What matching system uses a short length of transmission line connected in parallel with the feed line at or near the feed point?

A stub match involves connecting a short piece of transmission line (a stub) in parallel with the main feed line near the antenna's feed point. By adjusting the length of this stub and choosing whether its far end is shorted or open, you can introduce a specific amount of inductive or capacitive reactance to perfectly cancel out the unwanted reactance at the antenna's feed point. Other matching systems listed rely on entirely different physical mechanisms. A Gamma match uses a parallel rod and a series capacitor directly on the driven element. Delta and T-matches use angled wires or rods tapped outward on the driven element to step up the impedance. Only the stub match is built from an additional short length of transmission line.