Shakespeare 1 ft. Extension [5228-1]Galaxy Style 5228 1, 1 ft Heavy Duty Extension Mast One foot length. Constructed of high quality Shakespeare white fiberglass, and finished to match Galaxy antennas. This 1 " diameter extension 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. For light to moderate applications. Excellent for use with GPS or TV antennas to clear on board obstructions.