[Stephen McNamera] found a schematic for a grid leak radio online and decided to throw together a few tubes on a piece of wood and see how it worked. As you can see in the video below, it works well. The video is a bit light on details, but the web page he found the plans on also has quite a bit of explanation.
This is a companion discussion topic for the original entry at https://hackaday.com/2024/05/23/grid-leak-radio-draws-the-waves/