Might seem OTT but I clipped the wings of our 5-weeks-old Sussex, BR and Marans who were clearing between 3' to 4' of chicken wire. Had a BR clear my head easily (I'm 6' socked) and a Coucou de France on the coop roof and that's 7'. The other question is how far can they fly? A young Limousine hen hearing the kitchen door open covered 37' about 2' off the ground. I was so surprised I had to measure it out. Seriously could not believe it...