It's different for everyone. For me, ten years ago, I got interested in quadcopters back when making them yourself was the norm. There is a lot of radio involved, especially at long range. That sent me down the rabbit hole.

There is a kindly person on YouTube you might watch: KB9VBR. He operates out of US parks. A lot. Vast numbers of contacts for that sort of operation. He sells antennas on EBay as well.