Well, I just wondered if using a similar principle, and the TFormPoint command should be what you are looking for. My 'radar' was displayed as 2D, however, instead of a 3D representation as you wanted. I used lines to show height above/below a central point.
You will have to figure out the scale yourself, depending on distances needed, size of meshes and the size of your radar display of course.
You will have to figure out the scale yourself, depending on distances needed, size of meshes and the size of your radar display of course.