To illustrate technical articles about EM radiations,
I'm searching for thermal images of antennas during
transmission ?

"Fractenna"
But a true thermal digital image of an antenna in situ
is very difficult, because of convection currents.

Huh? Run some high power into the antenna and click the shutter button. What
could be simpler (assuming you have the right camera). Obviously need a fair
amount of power.

Could model it by simply looking at the current distribution in NEC (current
equals heat, neglecting many other factors).

Comnection currents ?? rolls eyes Okay, run the experiment in a vacuum
chamber smirk.

A more common mode is to attach thermal sensors
[WITH LONGER DANGLING WIRES???] at
various points on the antenna and map the temp
as a function of time.

Bull feathers. The leads would *obviously* (duh!!) screw-up the operation of
the antenna (unless you're proposing fibre optic temp sensors).



BTW - (giving you the opportunity to change the subject and not answer the
questions as per your normal MO thereby maintaining your extreme pompous to
idiocy ratio), did we ever sort out who really invented or developed or
suggested or discovered radiocarbon dating???????