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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 whip antenna is a form of monopole antenna. The antenna is designed to be flexible so that it does not break easily, and the name is derived from the whip-like motion that it exhibits when disturbed. Whip antennas for portable radios are often made of a series of interlocking telescoping metal tubes, so they can be retracted when not in use.
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.
Pursuant to the California Public Records Act (Government Code § 6250 et seq.) "Public records" include "any writing containing information relating to the conduct of the public’s business prepared, owned, used, or retained by any state or local agency regardless of physical form or characteristics." (Cal. Gov't.
The pointed lower end of the antenna ended in a large ceramic insulator in the form of a ball-and-socket joint on a concrete base, relieving bending moments on the structure. The first, a 665 foot (203 m) half-wave mast was installed at radio station WABC 's 50 kW transmitter at Wayne, New Jersey in 1931.
This feed shows aerials over San Francisco Bay after northern California was hit by a 7.0 magnitude earthquake late Thursday morning (5 December), prompting a tsunami warning. The quake struck ...
California's Advanced Clean Fleets rule aimed to set timelines for operators of trucks carrying everything from U.S. mail and UPS packages to 40-foot containers of goods and other cargo, to switch ...
The first act regulating the use of automobiles for safety reasons in California was established by the Vehicle Act of 1915. [6] The provisions of the first Vehicle Act relating to the department went into effect 90 days after the close of that legislative session. The department of Motor Vehicles was within the Department of Finance in 1921.