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Antenna Radiation (Spherical Wave)
E = cos(kr − ωt)/r

An antenna launches an outgoing electromagnetic wave whose amplitude falls as 1/r — the expanding ripples that carry Wi-Fi, broadcast and cellular signals through the room.
Computed & rendered in pure C# on the frozen OnlyCSharp 1.8 library — animation baked to GIF with the library's own
Gif encoder (no GPU, no ffmpeg, no external packages).