8.3dBd gain VHF 144MHz-148MHz; 11.7dBd gain UHF 430MHz-450MHz; 17ft tall; Omnidirectional; Heavy-duty fiberglass construction; 3 sections; Imp: 50ohm ; UHF female (SO-239) connector; Mast diameter accepted: 1-3/16″ x 2-7/16″; Includes mounting bracket & 3 stainless steel radials 20-1/2″;