> Just look at any birthday baloon. They arent spheres.
Yeah, I wondered about that. I guess a birthday balloon is a pretty complicated curve; but I doubt it comes closer to a paraboloid than it does to a sphere or a plane, anywhere on its surface.
But this thing isn't a telescope, it doesn't have to focus an image; it doesn't need to be a parabola, a sphere is fine for achieving highly-directional gain.
Yeah, I wondered about that. I guess a birthday balloon is a pretty complicated curve; but I doubt it comes closer to a paraboloid than it does to a sphere or a plane, anywhere on its surface.
But this thing isn't a telescope, it doesn't have to focus an image; it doesn't need to be a parabola, a sphere is fine for achieving highly-directional gain.