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File:Goubau line antenna lead-in Radio & Television News April 1955.jpg

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Description
English: First page of an article on the use of a Goubau line as a feedline (transmission line) for a UHF television antenna. The Goubau line, invented by G. Goubau in 1950, is an unusual type of radio transmission line used to conduct radio waves at UHF and microwave frequencies, consisting of a single insulated wire. At the ends, metal cones serve as a "launcher" to send the waves along the wire and "catcher" to receive the waves at the destination end into a coaxial cable. It has lower attenuation (power losses) per meter than more common transmission line such as coaxial cable or twin lead.

Alterations to image: Cropped out the text of the article, leaving the illustrations and captions, and rotated image by a few degrees to justify.
Date
Source Retrieved September 14, 2014 from Leonard Lieberman, "The G-Line Antenna Lead-In" in Radio and Television News magazine, Ziff-Davis Publishing Co., New York, Vol. 53, No. 4, April 1955, p. 124 on American Radio History site
Author Leonard Lieberman
Permission
(Reusing this file)		 This 1955 issue of Radio and Television News magazine would have the copyright renewed in 1983. Online page scans of the Catalog of Copyright Entries, published by the US Copyright Office can be found here. [1] Search of the Renewals for Periodicals for 1978 and later show no renewal entries for Radio and Television News. Therefore the magazine's copyright was not renewed and it is in the public domain.

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Public domain
This work is in the public domain because it was published in the United States between 1929 and 1963, and although there may or may not have been a copyright notice, the copyright was not renewed. For further explanation, see Commons:Hirtle chart and the copyright renewal logs.
Note that it may still be copyrighted in jurisdictions that do not apply the rule of the shorter term for US works (depending on the date of the author's death), such as Canada (70 years p.m.a.), Mainland China (50 years p.m.a., not Hong Kong or Macao), Germany (70 years p.m.a.), Mexico (100 years p.m.a.), Switzerland (70 years p.m.a.), and other countries with individual treaties.

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