> (An American antenna expert updated one of the equations around 20 years ago based on his experiments in antenna performance.)

What are you talking about?

Perhaps what throwaway8198 is referring to are the practical consequences of Maxwell's laws as formulated by an American team in the 1960s [1]. For a thorough, more recent study, I highly recommend [2].

[1] https://en.wikipedia.org/wiki/Chu%E2%80%93Harrington_limit

[2] http://web.eng.ucsd.edu/ece/courses/ECE222D/Spring2013/Lectu...