What two functions are performed by an antenna?

Name the two critical functions of antenna?
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"The two functions of an antenna are: (1) For transmission of a signal, radiofrequency electrical energy from the transmitter is converted into electromagnetic energy by the antenna and radiated into the surrounding environment (atmosphere, space, water); (2) for reception of a signal, electromagnetic energy impinging on the antenna is converted into radio-frequency electrical energy and fed into the receiver."
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"The fundamental efficiency of the radio detection and ranging can be shown to be relative on the product on the antenna expanse or even aperture and the bastardly sent electrical power. Investment inside antenna as a result provides strong brings about regards to system performance. Considering these traits and also the essential effectiveness of the microwave radar feeler, 2 preparations are generally put on: your parabolic saucer along with the range aerial."
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