Mine all free range, did have them behind a leccy fence, though did not look too happy, took it down, now they free range, and three days after taking the fence down started laying......though as i work at home it generally keeps the foxes out the way.
I live in the country on a farm and generally the gamekeepers keep the fox population down and there is also a source of cute little rabbits for them to feast on so I am taking the chance on having happy hens at an increased risk of predation.
Seems to really suit my Bhramas to just roam around.....they go for several hundred yards away to the rat nests to see what morsels are available....
I also pee around the perimeter of the garden, luckily no neighbours to offend.....when i lived in town i used to pee into a wine bottle and pour it around the perimeter, worked a treat.....
If any go missing i may go all Dirty Harry on Mr Fox..