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An antenna is said to be vertically polarized (linear) when its electric field is perpendicular to the Earth's surface. An example of a vertical antenna is a broadcast tower for AM radio or the whip antenna on an automobile.Horizontally polarized (linear) antennas have their electric field parallel to the Earth's surface. Television transmissions in the USA use horizontal polarization.y Joseph H. Reisert Antenna polarization is a very important consideration when choosing and installing an antenna. Most communications systems use either vertical, horizontal or circular polarization.
Beam Width The angular range of the antenna pattern in which at least half of the maximum power is still emitted is described as a âBeam Withâ. Bordering points of this main lobe are therefore the points at which the field strength has fallen in the room around 3 dB regarding the maximum field strength. This angle is then described as beam width or aperture angle or half power (- 3 dB) angle - with notation Î (also Ï). The beamwidth Î is exactly the angle between the 2 red marked directions in the upper pictures.