"After all this time, we still don't know whether I'm "seeing" radar or radio or infrared or some combination of everything."
Okay, it may have taken you guys two years but I've got this down for you.
1. You can see heat signatures or living organisms. That's infrared, congrats you can see it.
2. You can see the communications that the robots and machines make with each other. Since they communicate on radio waves, congrats you can see radio waves.
3. You can also see people speaking. This is sound waves, congrats you can see those too.
I think I figured that out in 30 seconds, what exactly is taking them so long?