Mi-24 Superhind RADAR (4km) cannot pick up ground vehicles within it's cone of vision and can ONLY see land targets within its PASSIVE IR/VIS SENSOR (3km/2km) - ONLY AFFECTS LAND VEHICLES.
Video is a quick 39 second pan around of Sand Airfield, Altis.
Mi-24 Superhind [CUP_O_Mi24_Mk4_CSAT_T] at 54m AGL - with Hunter MRAP [B_MRAP_01_F] at various angles and distances. (Also tested with [CUP_B_HMMWV_Ambulance_USMC] - same result)
In the ocean, behind, are several Seafox(Target) [CUP_B_Seafox_USMC] boats to show the radar does work for Sea based assets.
You can see the radar CANNOT acquire any land units.
(*Tested with ONLY CUP - Vehicles and related dependancies loaded*)