Discussion
Why is the half wave dipole so often used as a practical reference antenna?
Answer: D
A half wave dipole in the clear has a gain of 2.15 dBi and an impedance near 73 ohms, both known accurately enough to serve as a comparison standard, and it is cheap and easy to reproduce. Its gain is modest rather than high, its pattern is omnidirectional only in the plane perpendicular to its axis, and like every antenna it is affected by nearby objects, which is why a reference measurement is made on a proper range.
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