It looks like this o___o__o___o___o___o then there is a post in the ground that this is welded to. I tried to draw it here, but it wouldn't line up right.:
There are two of those. Each "o" represents a hook where the line connects to. Dh cemented it into the ground. The line stretches accross the 2. Then I made my own of a rope around 2 trees.