High Powered Ferrite Loaded Helicopter Antenna.
DEPARTMENT OF THE NAVY WASHINGTON D C
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The patent describes an inductive, internally fed, ferrite-loaded antenna mounted at the geometrical center of a helicopter. The antenna is capable of transmitting in the 2-30 MHZ range with particularly good characteristics between 2.0-3.5 MHZ and employs the air frame as a radiating element. The radiation pattern is circular and extends for a radius greater than 200 mi. at an altitude of 300 feet.
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