Discussion
What does the image of a vertical monopole in a perfect ground plane look like?
Answer: C
A vertical element's image is the same length below the surface with its current in the same direction, so the two together form a full dipole. A horizontal element's image carries opposite current, which is why a low horizontal antenna nearly cancels itself at low angles. The image is a mathematical device that satisfies the boundary condition of zero tangential electric field at a perfect conductor, and it applies to any source above such a plane.
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