Hmmm, fancy indeed. With 150kW feeding a dipole at 700 feet, I imagine that a cat's-whisker [0] would have done well-enough in London...
replyYes, I did exactly this in England 30 or so years ago. It was one of the suggestions in an electronics kit for children, the one with springs to connect the components together.
replyWe did that in my physics high school class.
replyThen we took away components until we had virtually nothing left, a diode I think(?), and still we had some signal.
Turns out there was a transmitter on the top of the hill the school was also on.
Fun times.
Look at this fancy pants needing a transistor for that /s
reply(but yes I do miss those simpler days - but I guess the basics now is making an Arduino flash an LED)