Master Sgt. James Shearer, 28th Communications Squadron transmission system radio maintainer, uses a compass to determine the position for a new helical antenna prior to installation on Ellsworth Air Force Base, S.D., Feb. 13, 2012. Shearer installed the new antenna to secure data transfer between military installations across the U.S. (U.S. Air Force photo by Airman 1st Class Zachary Hada/Released)