When you say "efficient" do you mean, that one antenna design vs another may generate more photons, or that the photons shoot off in a direction that makes them more usable for the receiver?
How does a Radio Antenna Work?
I'm trying to get a grasp of the physical mech.
You generate an AC signal on a conductor (i.e. at 30mhz)
The free electrons on the skin of the conductor osc. back/forth at 30mhz.
The acceleration / decleration of the free electrons causes photons to be...