The Antelope air defense system is a tactical ground-to-air anti-aircraft defense system used by the Republic of China (Taiwan) army. It employs a battery of four Tien Kung-I missiles mounted on atop a wheeled vehicle (such as a truck or humvee).[1] The Antelope system collectively includes targeting, guidance, communications components as well as the missiles themselves. It was developed beginning in 1995 as an outgrowth of the Tien Chien-I missile development program.[1] The precise operating range of the Antelope system is variously reported as 9 km [2], 18 km[1], and "4 miles"[3]. The Antelope system employs infrared guidance, and is similar in design to the United States-made Chaparral system.[3]