on the editor
0. set view distance and object distance to full (40000m)
1. make a BLUFOR radar that has more then 30km range with a custom config
2. place the radar at clear sight
2-1. add a UAV operator for player
3. place the OPFOR plane with radarTargetSize=1 at altitude 5000m 40km away
4. set the pilot behavior to careless and place the move waypoint to the radar
5. start the scenario and take control of the radar and watch
target won't appear on radar until it gets close to 21.5~21.7km.