Sigint/elint satellites

[totoro]

So those trios of sigint/elint sats that US and China have in droves, what sort of signals can they detect?

Infantry Battalion level Comms?
Long range Comms (hundreds of km distance)?
SAM battery targeting radar?
Radar of a maritime patrol helicopter?
Fighter jet radar?
Large shipborne air search radar?

All of the above? Just some of the above?

 

[Flyaway]

Fairly recent video from the NRO about SIGINT

View: https://www.youtube.com/watch?v=1o9b_3kYVh4&t=3s