Airman 1st Class James Vrtis, 99th Communication Squadron airfield systems apprentice, briefs about different types of radio equipment before the radio tower climbing demonstration June 7, 2013, at Nellis Air Force Base, Nev. The 99th CS uses ultra-high and very high radios with antenna couplers. The UHF/VHF transmitters provide signals the air traffic controllers receive from incoming aircraft and the signals the air traffic controllers transmit to incoming aircraft. (U.S. Air Force photo by Senior Airman Matthew Lancaster)
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