This set makes either a Mk 12 or a Mk 4 radar antenna. Accurate Mk 12 antenna and framing AND accurate Mk 4 antenna and its framing are included. A forming guide is included to help create the proper shape of the Mk 12 antenna or the Mk 4 which were different. Also includes mounting bracket and Mk 22 "orange peel" antenna. This set replaces the inaccurate Mk 4/12 antenna usually included in PE sets.