Discussion
What spacing between the driven element and the apex of a ninety degree corner reflector is usual?
Answer: B
A spacing near half a wavelength puts the images in the right phase to reinforce the direct wave and gives close to the maximum gain, with the impedance still manageable. Moving much closer collapses the radiation resistance and moving much further breaks the beam up into lobes. The figure follows from the same image reasoning that governs a dipole above ground, and recognising the two situations as the same problem saves learning either of them separately.
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