I don't think they mean (I hope) hoisted on the backstay at the same height as 2/3 up the leach. That would be just plain tacky and disrespectful. I fly my flag from the backstay, but at a height of exactly my reach when standing on the lazarette. This is my last choice, but there is no where on the stern to mount an appropriate flagstaff that wouldn't interfere with my radar mast, propane locker, windvane, dingy outboard etc... Lin and Larry Pardey do the same but I am not sure there is anything really appropriate. However, out of necessity (visiting foreign countries) this is the only place I can find that remotely resembles anything legitimate. Better than flying it from the spreaders or the masthead! I would say that if you can't fly it appropriately don't fly it at all, unless you are required to.