No gain in a pure isotropic source?

Butch KF5DE

Cecil Moore wrote:
Jerry Martes wrote:

Do antennas have gain or do they have directivity?


From Balanis: "Although the gain of an antenna is closely
related to the directivity, gain is a measure that takes into
account the efficiency of the antenna as well as the
directional properties of the antenna, and it is therefore
controlled only by the pattern."
--
73, Cecil, W5DXP



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