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| Keywords: US Navy 040607-N-8252B-078 Ground Aviation Radio Repairman Lance Cpl. Russel I. Holmes from St. Helena, Calif., checks the wiring on the VHF AS 3900 antenna.jpg turnstile antenna for satellite communication It consists of two Yagi arrays mounted on a boom with its elements at right angles fed in quadrature 90° out of phase in front of a circular screen reflector It radiates a beam of circularly polarized radio waves off its end which is pointed at the satellite Circular polarization is used for satellite communication since it is not sensitive to the relative orientation of the transmitter and receiver's antenna elements 2004-06-07 040607-N-8252B-078 Navy http //www navy mil/view_image asp id 14725 U S Navy photo PD-USGov-Military-Navy Elmendorf Air Force Base Northern Edge 2004 Yagi-Uda antennas Turnstile antennas Communication in Alaska | ||||
