Hertz to Rolf Harris, with an appearance by Elvis

Our own Rolf Harris shows us his "Dipole" Wobble Board antenna,



3D antenna field pattern



http://www.youtube.com/watch?v=ZKCB2V4IGL8&feature=related



Bedroom Hertz Radio Setup



now play with your own dipole

http://www.falstad.com/wavebox/

Now look at an atom which a mini wobble board.

http://www.falstad.com/qmatomrad/

Important points, EM waves get detached from antenna and the spark is just a switch.  This effect can be scaled down to atoms for light emmission.  The sparks were also the first detection of the photoelectric effect.