Showing Importance of Low Angle Radiation for Vhf Propagation

rr HE AEROVOX RESEARCH WORKER for July, 1949 contained a discussion of the fundamental properties of the half -wave dipole antenna and defined three basic configurations in which multiple dipoles are used to obtain desirable directional effects in transmitting or receiving radio signals. These arrangements included; collinear dipoles, broadside dipoles, and end -fire dipoles of both the driven and the parasitically excited types. Approximate figures for the power gains of these systems of dipole antennas, as compared with the field radiated by a single dipole, were also given. This issue will describe several typical examples of practical antenna designs which make use of these types of directivity and which are applicable in the VHF region for FM, amateur radio, citizens radio (although not in the VHF band) and other point-to-point communication circuits. The method used for