to be fair there's not much on the air these days to pick up using a crystal anymore (around me at least) but an SDR would let you teach much much more about w

to be fair there's not much on the air these days to pick up using a crystal anymore (around me at least) but an SDR would let you teach much much more about whats going on in the invisible :) https://www.hanselman.com/blog/software-defined-radio-is-a-great-way-to-bridge-the-physical-and-the-digital-and-teach-stem https://www.hanselman.com/blog/software-defined-radio-is-a-g... https://smile.amazon.com/NooElec-NESDR-Mini-Compatible-Packages/dp/B009U7WZCA https://smile.amazon.com/NooElec-NESDR-Mini-Compatible-Packa...