Heavy-Duty Galaxy Extension MastTwo feet length. Constructed of high-quality Shakespeare white fiberglass, and finished to match Galaxy antennas. This 1″ diameter expension mast can be used to increase height of an antenna and thus improve effective range, or to boost placement of an antenna above on-board obstructions. Stainless steel upper and lower ferrules with standard 1 in -14 thread Suggested mount: Shakespeare Style 4187 or 5187 One section, actual length 24″ Use an upper support bracket (sold seperately) if the lengt of antenna and mast total more than eight feet. Color: Galaxy white Specifications:Ferrule Type: Stainless SteelConstruction: FiberglassColor: WhiteLength (Inches): 24″Box Dimensions: 3″H x 3″W x 30″L WT: 1.6 lbsUPC: 719441200152Quick Guide (pdf)