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A parabolic antenna is a simple enough device, a curved reflector designed to focus all the radiation from the direction it’s pointed into a waveguide or antenna at its feedpoint. They’re easy enough ...

E-mail from listeners prompts two corrections: One about Latin confusion and the other about the Gateway Arch in St. Louis. MANY listeners wrote in to point out that the Arch is not a parabola, as we ...

Why are we asking for donations? Why are we asking for donations? This site is free thanks to our community of supporters. Voluntary donations from readers like you keep our news accessible for ...