Discussion
How does adding directors to a Yagi affect its performance?
Answer: A
Each director adds less than the one before, so gain rises roughly with the logarithm of the boom length, and the bandwidth narrows as more elements must be simultaneously near resonance. Beyond fifteen or twenty elements the return hardly justifies the length. Front to back ratio is chiefly the reflector's business, and the directors re-radiate rather than absorb. The diminishing return with aperture is a general feature of all antennas. Checking the units of each quantity catches a wrong formula before the arithmetic begins.
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