Ground Surveillance Radar

[Urban]

I'm looking for info about GSR (range, detection, ect).

In game this kind of devices are a little bit underestimated (low vision range) so :

1) increasing the vision range could be damageable for game balance ?
2) adding a 100 value to fire control will make them target for SEAD weapons but give an unbalanced AA capability :/

Any ideas ?