Wow! This thread sure brings back happy memories. In 1941 when I was about 13 I made a crystal set. A sheet of wood board about 10inches square, three wood screws holding the crystal, a toilet roll inner cylinder holder with a few turns of copper wire forming the coil, and a few turns of fuse wire wrapped round a matchstick as the catswhisker. Like Bebop, the bed springs acted as an aerial. Reception was crystal clear - no interference, and hidden under the bedclothes wearing earphones happy hours listening to music.
That was also a time when, despite the blackout (in the UK) never a threat of violence in the streets.

In many ways life was a lot happier in those days - before the era of pop idol music which nowdays assails our ears.

Ogre