@cr1901 @tubetime I remember back in the late 80s my Telecom Australia apprentice intake went to this AM broadcasting station and antenna https://maps.app.goo.gl/EM6Luyo98ve2NUeB9
The demonstration that stuck to this day was when looking at the transmission valve (thermionic) from the other side of a glass window if you held a disconnected fluorescent tube at one end and aimed the other end at the valve the fluoro tube lit up.