Some people are just so good at this stuff. I've tried to get better at circuits for decades but yeah, they're hard.
Here demonstrating early prototypes a full year before HackRF Kickstarter, including ridiculously cook huge spectrum analyzer [HackRF update with Jared Boone, Hak5 1417.1 - Hack Across America 2013] https://www.youtube.com/watch?v=l42mZ7BDB9A