20-70 MC monopole antennas on ground-based vehicles

Antenna design for ground-based vehicular application is discussed with particular emphasis on omnidirectional, vertically polarized types. Limitations of vehicle size and shape in controlling the efficiency and radiation patterns are considered. Pronounced interferences are shown to arise from the usually nonsymmetrical currents to the earth. Modifications of vehicle and antenna proved effective in reducing this interference. The radiation characteristics of vertical monopoles excited against the vehicle are shown over the frequency band.