I've got some real similar. I unscrewed the sprinkler head off the spike and put a 4' galvanized nipple in between them, then zip-tied the whole thing to T-posts. Before we installed the irrigation system in the orchard, we had 2 rows of 4 sprinklers each operating in overlapping 180° arcs, all connected with 2 hoses feeding them. Took some adjusting to get all the arcs set just right, but once they were it all worked great for the year and a half that we used them up there. I left them in place for a while, "just in case", when we finished installing the irrigation...I just took them up and pulled the posts last time I was home.
