Shakespeare Galaxy Extension Mast The Shakespeare Galaxy Extension Mast is constructed of high-quality white fiberglass and finished to match Galaxy antennas. This extension mast can be used to increase the height of an antenna and thus improve effective range. It can also be used to boost placement of an antenna above on-board obstructions. Features stainless steel upper and lower ferrules with standard 1-14 thread. Size Options 1 1 Diameter for light to moderate applications. Great for GPS and