G9C04 — General Class

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G9C04 : How does antenna gain in dBi compare to gain stated in dBd for the same antenna?
A Gain in dBi is 2.15 dB lower
B Gain in dBi is 2.15 dB higher
C Gain in dBd is 1.25 dBd lower
D Gain in dBd is 1.25 dBd higher
Correct Answer: Gain in dBi is 2.15 dB higher