5m parabolic dish at 300 MHz. Focal length set infinite to make dish a flat surface. Surface is illuminated by circular source at 1e6 m. Beam width of radiation reflected from dish is shown. Source is animated. Circular currents on surface are animated. Transverse standing waves above surface are animated. Source changed to linear polarization. Dish is illuminated by 1 nW. Source is translated for oblique incidence. Standing waves at oblique incidence are animated.

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