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G9C19

How does antenna gain stated in dBi compare to gain stated in dBd for the same antenna?

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AdBi gain figures are the same as the square root of dBd gain figures multiplied by 2.15
BdBi gain figures are 2.15 dB lower then dBd gain figures
CdBi gain figures are the reciprocal of dBd gain figures + 2.15 dB
DdBi gain figures are 2.15 dB higher than dBd gain figures