What is Yagi antenna?

The wooden antenna is an end-fired antenna in which an active vibrator (generally a folded vibrator), a passive reflector and a number of passive directors are arranged in parallel.

In the 1920s, this antenna was invented by Yagi Hideo and Toda Taiga of Tohoku University in Japan, and was called "Yamaki Uda Antenna", referred to as "Yashiki Antenna".

It has good directionality and has a higher gain than a dipole antenna. It is especially good for measuring direction and long-distance communication. If equipped with an elevation angle and azimuth rotation control device, it is possible to communicate with the radio station in all directions including the spacecraft as desired, which is not available from the upright antenna.