I don't see this under flag etiquette. Can a flag be displayed outdoors by hanging from a fence where a staff/pole is not available or allowed? I'm talking about a standard backyard wood plank fence where the flag would always be fully backed by the fence. It is not a fence where planks are spaced apart, it is a solid wood fence like you see in many backyards. If so, what is the correct way to attach it to the fence?