 The male plug somewhat resembles an RCA connector in size and shape, but instead of surrounding the pin, the sleeve is "folded" back over the coax.The pin is soldered to the center conductor of the coaxial cable coming from the antenna, and the grounded side forms a 1.5 inch (38 mm) long sleeve around the coax.The sleeve usually contains one or more longitudinal spring surfaces, which provide reliable electrical contact by wiping against the mating female socket.