1) Radio electronic 2) Radio frequency antenna type 
A Yagi-Uda antenna, commonly known simply as a Yagi antenna, is a directional antenna consisting of multiple parallel dipole elements in a line, usually made of metal rods. It consists of a single driven element connected to the transmitter or receiver with a transmission line, and additional parasitic elements: a so-called reflector and one or mo...
an end-fire array consisting of a driven element, one reflector element and one or more director elements NOTE - In practice, the reflector element may consist of an assembly of elements or a reflecting surface.