Antenna Boresight

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What is the definition of antenna boresight?

In the field of telecommunications and radar engineering, the term “antenna boresight” (sometimes called “boresight axis”) refers to the principal axis of a directional antenna that exhibits the highest gain, resulting in maximum radiated power. In the case of most antennas, the boresight aligns with the axis of symmetry of the antenna.

What are the applications for antenna boresight?