[Imp]

I just did a very quick test.
Visibility 100 all terrain open ground so nothing to interfere with LOS.
Year 1992 Russian ZSU-23-M42 vs ZSU-23-M43

They use same weapon etc only differences being one has radar the other FC15 & radar model has an EW rating.
Placed 6 of both, one of each in the same hex & then set up spotter planes & jets attack runs.
All planes used were EW 0 to negate EW rating of M43.
I did not bother to set experience identical for all units so not a definitive test but from watching a few passes dependant on range Radar controlled was 2-5 times more accurate than the none radar units.
The radar units were far more dangerous approaching 50% hit chance at a bit over half of the weapon range & well worth paying double for in game terms & that's without factoring in blocking terrain & low visibility.