Compass String, 5 m (16 ft 5 in), to use as compass aid String, 2 m (6 ft 7 in), to use as compass aid Spray paint or similar for marking ground Select a location with at least 10 meters (33 feet) of clear area around the mast. Mark the place for the mast concrete foundation at the center of the location. Use the string to draw a circle to the ground, around the mast foundation. Use a compass to check the orientation. Mark a location for the first guy wire foundation on the circle line to the West from the mast concrete foundation. Figure 1. Marking first guy wire foundation Mark also the opposite side of the circle. That will be your next center point. Figure 2. Marking the next center point From the new center point, use the string as compass and draw another circle to the ground. Mark the places where the 2 circles cross each other. They are the locations for the other 2 guy wire foundations.