It was located at Greenbury Point, in Anne Arundel County, across the Severn River from Annapolis, Maryland at coordinates . NSS Annapolis was used by the USN for submarine communication. The station consisted of an umbrella antenna supported by a 1,200-foot (365.76 m) high central mast, which was insulated against ground, 6 guyed masts of 800-foot (243.84 m) and 3 freestanding towers of the same height.