Direction Finding (DF) that refers finding the location of the radio signal sources is a significant application of the Ultra High Frequency (UHF). Practically, it is used for the locating, tracking and distinguishing the different radio signal sources. These systems are firstly used by the military and government especially in both World Wars. Currently, civilian and research centers are also studying on these systems. Antennas are the most important parts of the direction finding systems. Different types of antennas have been used in these systems like dipole, monopole, loop, bicone and discone antennas. Additionally, a DF antenna should be light and small in size, especially for mobile and tactical applications.
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