The Hy-Gain Model TH3-Mk3 is a 3 element tri-bander designed for operation on 10, 15 and 20 meters. Multi-banding is accomplished through the use of Hy-Gain's all new Hy-Q traps. The antenna is designed to fit a 1 5/8" OD mast and can be rotated with a heavy duty TV rotator. This new Thunderbird is equipped with Hy-Gain's all new Hy-Q traps. Threse traps have undergone exhaustive environmental testing at Hallicrafters Reliability Evaluation Laboratory and passed all tests with flying colors. The TH3-Mk3 also uses hardware that is iridite treated to Military Specifications for maximum corrosion resistance. The large diameter boom and all elements are constructed of heavy gauge seamless aluminum tubing. Built for years of trouble-free service this is absolutely the finist 3 element tri-bander on the market today.