Here's a 60 Minutes piece discussing it: https://www.youtube.com/watch?v=ZBtMbBPzqHY

Here's a 4 hour interview with the pilot, David Fravor, on Lex Fridman's show where he goes into much more detail than you'll probably read elsewhere: https://www.youtube.com/watch?v=aB8zcAttP1E

This wasn't just a single radar. It was an AEGIS system compromised of multiple ships with state of the art radars, multiple plane radars, and visual confirmation by several pilots. They were tracking it for multiple days.