Phased 1/2 wave elements in a collinear array with choking sleeve to suppress cable radiation. 9dB gain. This highly sophisticated design is outstanding for long distance communications. Extra rugged. Brass and copper elements, stainless steel ferrule with standard 1″-14 thread, includes 20′ RG-8/X cable and a PL-259 connector. Two sections: base 105″, tip 105″. Suggested mount: 409 or 410 mounting kit.