I also find it pretty interesting! I recently thought of it while watching the upper stage losing stability and tumbling out of control. It made me realize that it was maintaining the video feed even as it tumbled / spun.

Is it just that the radio goes out in all directions and is thus received in sufficient quantities to build the video feed?

That is from five years ago. Today, they use Starlink, at least on Starship.

https://x.com/EvaFoxU/status/1798695001746289112 https://x.com/FutureJurvetson/status/1768282662710710639