Adcock antenna
![Adcock radio range ground station. Hundreds of these stations were deployed around the U.S. alone.](/Images/godic/202412/17/LFR-photo5544.jpg")
![Diagram from Adcock's 1919 patent, depicting a four-element monopole antenna array; active antenna segments are marked in red.[1]](/Images/godic/202412/17/Adcock-fig35544.jpg")
The Adcock antenna is an antenna (British English aerial) array consisting of four equidistant vertical elements which can be used to transmit or receive directional radio waves.
The Adcock array was invented and patented by British engineer Frank Adcock in 1919 as British Patent No. 130,490, and has been used for a variety of applications, both civilian and military, ever since. Although originally conceived for receiving Low Frequency (LF) waves, it has also been used for transmitting, and has since been adapted for use at much higher frequencies, up to Ultra High Frequency (UHF).