Which matching system for Yagi antennas requires the driven element to be insulated from the boom?

The Beta match, also commonly known as a hairpin match, is used to match a low-impedance Yagi driven element to a standard 50-ohm transmission line. This matching system functions as an inductive shunt placed across the feedpoint, which works in combination with the capacitive reactance of a slightly shortened driven element. Because the hairpin connects across the two halves of the driven element at the center feedpoint, the driven element must be split into two pieces and electrically insulated from the grounded boom. In contrast, Gamma matches and T-matches typically allow the center of the driven element to be physically and electrically bolted directly to the boom.