How to mark and drill holes in tubing that are 180 degrees apart...........without using a drill press or drill guide!by N4UJW How? Go back to your school days! How to use a protractor for marking and drilling holes in round tubing used for the boom of Yagi antennas or other round tubing projects.80 degree protractor on left....360 degree version on right. (not to scale). Now since tubing is usually a perfect 360 degree circle when viewed from the end, you want to be able to find a way to mark both sides of it for the Yagi antenna element holes we are using in this example that you want to drill.
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