Discussion
What is the approximate gain of a well designed ten element Yagi?
Answer: B
A ten element Yagi on a boom of about two wavelengths gives 12 to 13 dBi, and adding elements raises it slowly from there. A parabolic reflector reaches 25 dBi only with an aperture of many wavelengths, and 3 dBi would be barely better than a dipole. Very long Yagis do exceed 18 dBi, so that is not a ceiling. Having a realistic figure in mind lets an extravagant advertised gain be recognised for what it is.
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