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The length of a whip antenna is determined by the wavelength of the radio waves it is used with. Their length varies from compact electrically short antennas 1 / 10 wavelength long, up to 5 / 8 wavelength to improve directivity. The most common type is the quarter-wave whip, which is approximately 1 / 4 wavelength long.
A whip antenna with several rods extending horizontally from base of the whip in a star-shaped pattern, similar to an upside-down radiate crown, that form the artificial, elevated ground plane that gives the antenna its name. The ground plane rods attach to the ground wire of the feedline, the other wire feeds the whip.
Aerial photography (or airborne imagery) is the taking of photographs from an aircraft or other airborne platforms. [1] When taking motion pictures, ...
Aerial archaeology; Aerial image library; Aerial photograph interpretation (geology) Aerial photographic and satellite image interpretation; Aerial video; Aero Pictorial; Aerofilms; Air-to-air photography; Aircraft Operating Company; ARGUS-IS; Astrocam; Atmospheric correction
Oblique aerial photographs are captured when the cameras are set at specific angles to the land. [5] It is a very helpful enhancement or addition to the traditional vertical image. [2] It allows the vision to pass through a relatively high proportion of the plant cover and leaves of trees. [2] Oblique aerial photographs can be classified into ...
The rubber ducky antenna (or rubber duck aerial) is an electrically short monopole antenna, invented by Richard B. Johnson, that functions somewhat like a base-loaded whip antenna. It consists of a springy wire in the shape of a narrow helix, sealed in a rubber or plastic jacket to protect the antenna. [1]
A shot taken from an aerial device, generally while moving. This technique has gained popularity in recent years due to the popularity and growing availability of drones. Arc A dolly shot where the camera moves in an arc along a circular or elliptical radius in relation to the subject ("arc left" or "arc right") Backlighting (lighting design)
Due to their immense size, the location of the Bondville array and the other post-war antenna arrays are clearly visible in high-resolution aerial photography now available on the internet Also in 1959, a contract to build a larger CDAA — the AN/FLR-9 antenna receiving system — was awarded by the U.S. Air Force to GT&E Sylvania Electronics ...