1. Adjust the compass to 5.41 inches (137 mm), set its point at the intersections of the two vertical lines and two of the 7.07-inch arcs, and draw an arc near the end of each vertical line. The photo defines the nine points at which holes will be drilled for the screw posts, but do not draw dots. Note that the distance between the screw posts will be identical to the dimensions provided on the antenna drawing, except for the screw posts at the bitter ends of the two short stubs. The copper element stub links will be the same length as specified on the antenna drawing, but the screw posts for the stubs are intentionally 0.18 inch closer together.
2. If drawing on paper, tape the paper to the base board and transfer the nine points to the board by poking through with a very fine sharp pin. It is OK to draw a light open circle, at least a quarter inch in diameter, around each of the pin points in the board to make it easier to locate them when drilling.