A Yagi–Uda antenna (commonly just called a Yagi) is a directional radio antenna consisting of multiple metal elements arranged along a central support boom. The basic parts include:
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Driven element: the active element connected to the feedline that actually transmits or receives radio energy.
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Directors: shorter parasitic elements in front of the driven element that focus and direct the radio waves.
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Reflector: a slightly longer parasitic element behind the driven element that reflects energy forward.
The combination of these elements creates a directional radiation pattern with enhanced forward gain, meaning stronger signals in one main direction.
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