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Message: <blockquote data-quote="Channel Hopper" data-source="post: 703171" data-attributes="member: 175144">Using a tape measure between feed centre and random points on the reflector edges gives a rough idea, but a boresight tool is the way forward. You can make one yourself, using a stiff rod, or a piece of 15mm copper pipe.Another way is to remnove the feed cover off the horn and use a laser pointer. If you can score a circle on the reflector surface with the laser that is equidistant from the point where all quadrants meet up , then you are pointing directly down the centre.</blockquote>