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In radio communication, an omnidirectional antenna is a class of antenna which radiates equal radio power in all directions perpendicular to an axis (azimuthal directions), with power varying with angle to the axis (elevation angle), declining to zero on the axis.
Omni Directional 120 dB at 100 ft. Extremely short lived siren. Only proof of this ever existing is from an ACA ad in 1968. [1] This was one of the only sirens ACA didn't encase in fiberglass. Cyclone 120: Electro-Mechanical 40 or 50 8/12 1970–1980 Omni Directional 120 dB at 100 ft. Produces 120 dB at 100 feet.
the BattleBot OMINOUS, shown here with a Kiwi Drive. A Kiwi drive is a holonomic drive system of three omni-directional wheels (such as omni wheels or Mecanum wheels), 120 degrees from each other, that enables movement in any direction using only three motors.
i.e. the directional dependence of the (receiving) effective aperture and the (transmitting) gain are identical (QED). Furthermore, the constant of proportionality is the same irrespective of the nature of the antenna, and so must be the same for all antennas.
These curves were developed from extensive measurements using vertical omni-directional antennas at both the base and mobile, and are plotted as a function of frequency in the range 100–1920 MHz and as a function of distance from the base station in the range 1–100 km.
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A blade antenna on a military aircraft in Japan. This is not a dual-band type. A dual-band blade antenna is a type of blade antenna, which is a monopole whip antenna mounted on the outside of an aircraft in the form of a blade-shaped aerodynamic fairing to reduce air drag.