Antenna Terms

dB: Relative comparison unit.

dBm: Transmitted power. -30dBm is 1 µW. 0dBm is 1 milliwatt. 30dBm puts out 1 Watt.

dBi: Gain of an antenna as referenced to an ISOTROPIC source (point source, which does not exist).

dBd: Gain of an antenna as referenced to an DIPOLE source.

A simple dipole antenna has a gain of 2.41dBi, and a gain of 0dBd (dBi is better for advertising).

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