I used a n to n adapter with one of the fittings hacksawed off. The loop is the standard circumference, but in a circle rather than a square to make life easier.
How about a link to the design formula?
Oops - - I should have done the Google search first - -
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Actually, I never saw that bicircle page. I just used circles based on a post from Jeff Lieberman. I followed the Martysbug website as close as possible except I used loops instead of squares. The wire length is the same. Note the two wire feed used on that bicircle page is considered to be the wrong way to do the feed. My feed is coaxial. Instead of the pipe and coax shoving, I just hacked up a N to N adapter.
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