Studying Maxwell's equations brings surprising clarity and odd questions to my mind. In this case, I was going through the Point form and Time Harmonic form of the four equations and a line in my textbook caught my eye. It goes like this "---time-varying fields or waves are usually due to accelerated charges or time-varying currents such as shown in fig(Figure shows a sine wave and a square wave). Any pulsating current will produce radiation (time-varying fields). It is worth noting that the square wave is a resultant of emitted radiation in digital logic boards. " Source: Principles of Electromagnetics by Matthew N.O. Sadiku (6th Edition)
In this context, I find it odd to notice and ask, why we have never seen oscillating charges produce em waves, like for instance an antenna. Granted, most antennas are designed to work at much lower frequency parts of the EM spectrum, but if for instance, we were to make an antenna, capable of generating signals, oscillating at frequencies corresponding to the visible spectrum, shall we be able to see the wave being generated?
And, if my question is stupid, I'd love to be told why... :)