Richard Feynman has a short book on Quantum electrodynamics for dummys. Otherwise known as QED: The Strange Theory of Light and Matter. Read that as many times as you need to break you of any preconceived notions about how light works.

As for sin waves etc. It's better think of light oscillation between it's energy as an electric field and a magnetic field at right angles to each other. Although I think that's kinda gross and wrong.

As for an antenna producing visible light, in theory there isn't any reason. Because radio waves are light. The problem is practicalities.