So, correct me if I'm wrong, or point out what I'm misunderstanding,
The radar must have been set up correctly based upon,
1. The gain picking up a large target at 6 miles, assuming it was land. Gain adjusted correctly for land.
2. The tilt picking up the same target, too low it wouldn't have seen out to 6 miles, too high, it would have looked over it, as it picked one up at 6 miles then the tilt should have captures the more immediate target?