4-meter (13') bell tents are best set-up on a flat, 18-20 foot diameter space. 5-meter (16’4") bell tents are best set-up on a flat, 25-30 foot diameter space. A 6-meter bell tent could use a 30-35 foot diameter for a comfortable set-up.If you are pitching several tents, then the guy lines can overlap to share some of the space.