Just place a bunch of waypoints over the route you want the patrol to go, then click the first one where you want them to start, then shift click on the next one in the circle and press "link". Continue linking them until you get to the final one, you need to shift + click the last one and then shift + click your first waypoint, this will make the patrol continuous. You may also wish to lower the radius value of each waypoint otherwise the units may spread out greatly.
Hope this helps, if you want an actual circular patrol area, I don't know how to do this other than by placing the waypoints carefully.
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