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If a 3 dBd gain antenna is replaced with a 9 dBd gain antenna, with no other changes, the Effective Radiated Power (ERP) will increase by:
4
The increase in antenna gain is 9 dBd - 3 dBd = 6 dB. A 6 dB gain increase corresponds to a power multiplication factor of 10^(6/10) = 10^0.6 ≈ 3.98, which is approximately 4 times.
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