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The article translation from:http://www.21say.com/gamma-%ce%b3-match/

Gamma (γ) matching is actually half of T-matching for 50Ω coaxial cable and connections, is a very convenient way of matching. Which d1> d2 ratio the greater the wider the spacing S, γ ι longer rod length, then the higher input impedance.
Gamma match the adjustment process as follows:
① variable capacitor will short circuit;
② in the feeding point to a standing wave string table (table should be as close as possible standing-wave antenna);
③ by the transmitter input signal, and the frequency changes from low to high, while observing the standing wave situation;
④ lowest standing-wave antenna is the actual resonant point, if we do not meet the requirements, you can change the length of the antenna oscillator;
⑤ the restoration of the variable capacitor, in the transmitter and antenna into the resonant frequency of the same signal edge capacitance can adjust so that the minimum standing wave, when the standing wave may be more than 1.5;
⑥ the gamma rod and Oscillator route between the short range of movement in a few centimeters, and then repeat the previous step adjustments, the standing wave close to one.
Gamma match connection methods as shown below.

Gamma-band matching at the time in different part of the data as shown below.