Unidirectional antennas for 450 to 460 mc

The 450- to 460-mc emergency communications band is, in a sense, between vhf and microwaves as far as unidirectional antennas are concerned; therefore, antennas commonly used for both applications are practical possibilities for this band. It is the purpose of this paper to summarize the characteristics of several types of antennas that might be used for this application. While there are many types of unidirectional antennas, three stand out as presenting the best possibilities from a practical standpoint. They are the corner reflector, the Yagi or parasitic array, and the parabolic.