Zone Size not work or do i something wrong?

i need a elips as a zone
Launch Site is to big to the left and right site

        "Zone Radius": 100.0,//If this not greater than 0, it will become the cube zone.
        "Zone Size": {//Cube zone size
          "x": 0.0,
          "y": 0.0,
          "z": 0.0
        },

You need a cube zone