What antenna matching system matches coaxial cable to an antenna by connecting the shield to the center of the antenna and the conductor a fraction of a wavelength to one side?

Explanation

That description is the gamma match: the coaxial shield goes to the electrical center of a continuous driven element and the center conductor taps onto the element a fraction of a wavelength out along one side, usually through a series capacitor. The one-sided, asymmetric tap distinguishes it from the T-match, which does the same thing symmetrically on both sides.