Under the same input power, gain is the ratio between the highest antenna's radiated power intensity and the standard unit antenna. Antenna gain represents the convergence of the radiation energy at the pointing direction.
If Gain G=13dB=20 , to radiate 100W with the antenna, it only needs 100W / 20 = 5W input power.
A half wave length dipole = 2.15dBi.
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