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Overview; electromagnetic wave propagation; basic radio system parameters; introduction to diffraction, reflection and scattering; diffraction theory; clear-air characteristics of the troposphere; nature of precipitation and cloud; prediction of reliability when degraded by clear-air effects; prediction of reliability when degraded by precipitation and cloud effects; principles for wideband propagation; wideband on terrestrial trunk routes and Earth-space paths; propagation aspects of mobile spread spectrum networks; prediction of signal levels likely to cause interference for frequencies above 1 GHz; basic physics of the ionosphere; surface waves and sky waves below 2 MHz; propagation of radiowaves in the ionosphere; HF applications and prediction; VHF and UHF area coverage applications; a brief review of some commercial applications of millimetre waves.