The early trends in microwave antenna design grew out of the practice of using dipole systems at longer wavelengths. Nevertheless, little systematic information has been obtained about microwave dipole systems. This is partly due to the greater difficulty in applying theory to practically useful microwave dipoles and partly to the urgent military needs which prevented systematic research during the early development in this field. More recently, attention has been concentrated on wave guide and horn radiators, which are more amenable to quantitative analysis. Consequently, the design of microwave dipole antennas is still in the empirical stage; quantitative data are available only with reference to particular systems.This chapter includes a discussion of the following: characteristics of antenna feeds; coaxial line termination; asymmetrical line termination; symmetrical energised dipole - slot fed systems; shape and size of the dipole; directive dipole feed; dipole disk feeds; double dipole feeds; and multi-dipole systems.