Looking at the first picture in #142, I can see that new radar 2.0 representation is indeed more correct; you have some hills obscuring the radar LOS that are not shown in the old version. Just pay attention to the right side, there are hills whose radar Shadow is not existing in 1.5.7.
The problem is that hills' shadows and water bodies share same color which makes the picture somewhat confusing, but it's correct; water absorbs almost all radar energy so no return is detected.