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Message: <blockquote data-quote="moonbase" data-source="post: 1134592" data-attributes="member: 178786">As 40.5W is circular polarity you should not need to rotate the pipe to get the signal peaked. The critical positioning for the pipe and the LNBF is the orientation of the LNBF twin probes with respect to the steps in the pipe.The method I used was to imagine a line between the internal steps on opposite sides of the pipe and get this line to bisect the 90 degree angle that the twin probes are disposed at.The method outlined above by [USER=175005]@John[/USER]  is more accurate as it measures actual field values, the bisection method is more theoretical and may need fine tune adjustments.</blockquote>