The model 02102 antenna is a rugged tapered Stainless Steel antenna built for use on both automatic and manual tuning units (& is ¼ wave on 27MHz). Its Heavy Duty Stainless Steel rod and robust fittings are designed to withstand rough environments. The 02102 antenna radiating section is a Spring Hard, Ground & Polished 17/7PH tapered Stainless Steel rod. Whip top and bottom fittings are constructed of Brass, finished in a Nickel Plating. The radiator is securely screwed into the base ferrule.