File:Bowtie UHF TV antenna 1954.png

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Bowtie_UHF_TV_antenna_1954.png(256 × 461 pixels, file size: 7 KB, MIME type: image/png)

Summary[edit]

Description
English: The Channel Master "Multibow" model 410, a reflective array or "bowtie" UHF television antenna from 1954. It was used for reception of the analog UHF TV channels from 470 to 890 MHz. It consists of four "bow tie" triangular half wave-dipole driven elements fed in phase, in front of a flat metal grill reflector. The triangular shape of the dipoles broadened their bandwidth, allowing it to cover the whole UHF band. The 4 vertical stacked elements narrow the beam pattern in the vertical direction, giving additional rejection of ground noise. The antenna sold for $11.11.
Date
Source Retrieved August 6, 2014 from Radio and Television News magazine, Ziff-Davis Publishing Co., Inc., New York, Vol. 51, No. 4, April 1954, p. 77 archived on http://www.americanradiohistory.com/
Author Unknown
Unknown author
Permission
(Reusing this file)

This image is from an advertisement for Channel Master Co. 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[edit]

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This work is in the public domain in the United States because it was published in the United States between 1923 and 1977 without a copyright notice. See Commons:Hirtle chart for further explanation. 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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