A Yagi 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. The design allows it to focus radio waves in a specific direction, making it effective for receiving and transmitting signals over long distances. Yagi antennas are often used in applications such as television reception, amateur radio, and wireless networking. They are named after their inventor, Hiroshi Yagi, who developed the antenna in the 1920s. Due to their efficiency, Yagi antennas are popular for enhancing signal strength in various settings.