What is the efficiency of the antenna?
The overall antenna system efficiency and gain are related and depend on the antenna’s radiation resistance as well as on the other losses that are present within the entire antenna system. Antenna radiation resistance is derived from the height of the antenna in wavelengths which depends on the particular antenna and operating frequency. For coil loaded antennas and antennas operating at frequencies which make them longer than 1/8X, the determination of the radiation resistance for each particular antenna can be quite complicated. Antenna design handbooks may be consulted for the necessary background theory. When operated between 500 and 1700 kHz, coil loaded antennas exhibit efficiencies ranging from approximately 18% to 65% for the V33070-CL2 and 5% to 50% for the V147-CL2. Coil loaded antennas are preferred at lower frequencies as they help to avoid the use of excessively high voltage production at the output of the tuning unit and at the antenna feed point. The magnitude of the ot
