In a 3-element Yagi antenna, which element is connected to the transmission line?

In a Yagi antenna array, only one element is directly connected to the transmitter or receiver via the coaxial cable or transmission line. This active element is appropriately named the "driven element" because it is directly driven by the radio's power. The other elements, specifically the directors and reflectors, are known as parasitic elements. They receive their power entirely through electromagnetic coupling through the air from the driven element, rather than through direct physical wire connections.