Driven and parasitic elements
In an antenna array made of multiple conductive elements (typically metal rods), a driven element or active element (also called driven radiator or active radiator) is electrically connected to the receiver or transmitter while a parasitic element (or passive radiator) is not. == Driven elements == In a multielement antenna array (such as a Yagi–Uda antenna), the driven element or active element is the element in the antenna (typically a metal rod) which is electrically connected to the receiver or transmitter.
Source: Wikipedia — Driven and parasitic elements (CC BY-SA 4.0)