You can build your own AM radio in less then an hour with a large metallic object (car, bike, large piece of scrap metal, basketball pole), some aluminum foil, a small piece of copper, and any sort of speaker.
It’s a pretty common childhood science experiment where I am to build functional jerryrigged radio.
But you are right, building functional AM radios was and is pretty common for how cheap the components are. Plus I’m pretty sure I can still go to a store and buy a small working radio for less then 20 bucks.
Woof, TV’s were already a popular concept before WW2 in the US, but their development was halted by the war. However once the war ended, television exploded in popularity with the establishment of a dedicated signal network, and it was a staple item in almost all homes by the mid/late 40’s.
The South African regime was good if you were a Boer emerald mine owner. If you were anyone else? Not so much.