English: Antenna invented by early radio researchers Oliver Lodge and Alexander Muirhead used in their wireless telegraphy system. The two sections are attached to the two output terminals of the transmitter, the top section is the antenna while the bottom serves as a counterpoise. It is the first use of a counterpoise, which Muirhead patented in 1907.
This media file is in the public domain in the United States. This applies to U.S. works where the copyright has expired, often because its first publication occurred prior to January 1, 1929, and if not then due to lack of notice or renewal. See this page for further explanation.
This image might not be in the public domain outside of the United States; this especially applies in the countries and areas that do not apply the rule of the shorter term for US works, such as Canada, Mainland China (not Hong Kong or Macao), Germany, Mexico, and Switzerland. The creator and year of publication are essential information and must be provided. See Wikipedia:Public domain and Wikipedia:Copyrights for more details.
Captions
Add a one-line explanation of what this file represents