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- The radiation pattern of a simple omnidirectional antenna, a vertical half-wave dipole antenna. In this graph the antenna is at the center of the "donut," or torus. Radial distance from the center represents the power radiated in that direction. The power radiated is maximum in horizontal directions, dropping to zero directly above and below the antenna. (en)
- Animation of an omnidirectional half-wave dipole antenna transmitting radio waves. The antenna in the center is two vertical metal rods, with an alternating current applied at its center from a radio transmitter '. Loops of electric field ' leave the antenna and travel away at the speed of light; these are the radio waves. This diagram only shows the radiation in a single plane through the axis, the radiation is symmetrical about the antenna's vertical axis. (en)
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