Every true nerd gets his or her amateur radio licence.
Experimenting with transmitters, joining the weekly net discussions on electronics, getting the privileges to transmit high power on your FPV rig or just for the nerd cred.
I have made contacts all around the world at one time or another. And when you are heard by someone or the far side of the world, it really makes you think.
From that alone I gained a great deal of satisfaction from learning, passing my test, and building a small station.