A Yagi, or Yagi-Uda antenna, is a type of directional antenna commonly used in radio communications. It consists of multiple elements, including a driven element, a reflector, and one or more directors, which work together to focus radio waves in a specific direction. This design enhances signal strength and reception, making it popular for television and amateur radio applications. The Yagi antenna was invented by Haruji Yagi and Shintaro Uda in the 1920s. Its efficiency and simplicity have made it a staple in various fields, including telecommunications and broadcasting. Yagi antennas are often mounted on rooftops or towers to improve signal quality and range.