About a month ago we put up a 20 x 30 foot high hoop or high tunnel house up in the garden. We used chain link top rail bent to a curve on a cool device I bought from lostcreek.net. It was the C-20 which bends either 16 or 20 foot wide hoops. We used the 20 foot width. I discovered that it is really important to have a very level place in which to put it. Currently we are in Ukraine on a adoption journey but really looking forward to returning and working in the garden again.