The center fed TT2C is 24"L and 1/2" Dia. complete with 6 feet of high quality 95% braid sheilded cable for elimination of EMI from fans, blower motors, wiper noise, etc and center mounting bracket. The TT-2C is designed primarily for overhead console mounted radios, but provides excellent performance when mounted under dash. All our antennas can be mounted anywhere in fiberglass vehicles and only a *minimum clearance in steel. " * 3/4".