[Grug Huhler] built a simple Tayloe mixer and detector on a breadboard. He decided to extend it a bit to be a full-blown software defined radio (SDR). He then used WSJT-X to monitor FT8 signals and found that he could pick up signals from all over the world with the little breadboard system.
This is a companion discussion topic for the original entry at https://hackaday.com/2024/03/19/breadboard-sdr-doesnt-need-much/