Hi Christoph,
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The image you uploaded from Dave's excellent presentation actually shows a circumference of 13.8m; close, but not quite the 15m you mentioned.
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I currently have an Azi-Loop in the construction process; it's been taking some months due to other commitments. I am designing it to be easily transportable to take it from home to DXpedition sites, and also so that it will be mostly free-standing (fewer stakes and structures for the local deer to trip over or damage :^)? ?Like you I want the Azi-Loop to resist storms; I live on a hill above Aberdeen, WA USA, and we are vulnerable to Pacific coastal weather. The self-supporting "arms" for the lower horizontal loop segments are made from 3/8-inch dia. fiberglass rods (so-called driveway flags or markers). My hope is that the semi-flexibility of the rods will let the structure bend but not break in the winds.
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As you've read, the Azi-Loop designer Dave recommends a modest 9.0m circumference. The dimensions of the Azi-Loop I'm building work out to a 10.56m circumference, so that's roughly similar to the size you are considering. Like you, my primary application will be the medium wave range.
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Unfortunately I cannot give any comments just yet on performance, but hopefully in 2-3 weeks! I have a DXpedition to a beach location planned for mid-April, so I definitely need to have the antenna ready by then.
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You are probably familiar with the name of my Pacific Northwest DXing pal, Dr. Walt Salmaniw. He has an Azi-Loop among his antennas for MW DXing, at his Haida Gwaii, BC Canada vacation home. If you contact him I'm sure he'd be happy to give you comments on the antenna's performance. However, his antenna is built considerably larger than 10-15m circumference we are discussing. He decided to go larger since he has nearly zero chance of overload at that remote location.
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73,
Guy KE7MAV
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Guy Atkins