Hi folks, EM radio signals range in frequencies from a couple Hz up to approximately EHF (30-300GHz)... As we exceed the 300GHz threshold, we begin to approach the infrared section of EM spectrum, and furthermore into the visible light area of the spectrum. My question is, what happens on the transmitter side of things if you begin pushing frequencies out past 300Ghz?...Does the antenna itself begin to glow infrared, and eventually emit light? What physical implications would arise if a radio tower pushed frequencies in the visible range? In other words, how would passing the radio frequency threshold manifest from a physical perspective? Thanks!