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File:Dual corner reflector UHF TV antenna.png

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Dual_corner_reflector_UHF_TV_antenna.png (220 × 396 pixels, file size: 68 KB, MIME type: image/png)

Summary

Description
English: A dual stacked rooftop corner reflector antenna for UHF television reception from 1954. Corner reflector antennas were widely used for reception of analog UHF TV channels, from 470 to 890 MHz. Each of the two stacked halves of the antenna consists of two bowtie dipole driven elements in front of a reflector made of two flat wire screens joined at a 90° angle. The triangular "bowtie" shape of the driven elements gives them a wide bandwidth to cover the UHF band. Using two stacked antennas doubles the horizontal gain, increasing it by 3 dB, reducing reception of ground and sky noise.
Date
Source Retrieved August 10, 2014 from Radio and Television News magazine, Ziff-Davis Co., February 1954, p. 71 on http://www.americanradiohistory.com
Author Unknown authorUnknown author
Permission
(Reusing this file)		 This image is from an advertisement without a copyright notice published in a 1954 magazine. In the United States, advertisements published in collective works (magazines and newspapers) are not covered by the copyright notice for the entire collective work. (See U.S. Copyright Office Circular 3, "Copyright Notice", page 3, "Contributions to Collective Works".) Since the advertisement was published before 1978 without a copyright notice, it falls into the public domain.

Licensing

This work is in the public domain in the United States because it was published in the United States between 1929 and 1977, inclusive, without a copyright notice. For further explanation, see Commons:Hirtle chart as well as a detailed definition of "publication" for public art.
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 (50 p.m.a.), Mainland China (50 p.m.a., not Hong Kong or Macao), Germany (70 p.m.a.), Mexico (100 p.m.a.), Switzerland (70 p.m.a.), and other countries with individual treaties.

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February 1954

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Date/TimeThumbnailDimensionsUserComment
current18:01, 2 May 2021Thumbnail for version as of 18:01, 2 May 2021220 × 396 (68 KB)MaterialscientistFFT
15:11, 17 June 2015Thumbnail for version as of 15:11, 17 June 2015220 × 396 (35 KB)ChetvornoUser created page with UploadWizard

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