With exception of poultry netting, fences for me at best leaky when chickens motivated to forage around them. Larger perimeters with ample forage and cover within helps. Fencing serves more to repell predators and make job for dogs easier.
My coyotes are not capable of going under fencing that is only six inched above the ground (based on observations). Red Fox cannot do it either. Mine go past charger as well while it clicks and shorts in fence pop. The sound simply lets them know the fence is hot. If they know they will not...
Sometimes you can have a predator come around for a long time without going after your birds even when the birds are free-range. My predators seem to have a handle on what it is abundant and easy. Even when coming through my place daily they did not go after my birds as had not obvious need at...