Once they find easy food, they will keep coming back until they pick off all your birds.
You will need to secure your birds in your run until the fox is killed or loses interest.
And fox can climb fences, so you have to have top.
Also keep your coop locked at night.
Coyote urine will only work until the fox figures out there really isn't a coyote around. And it will get used to the lights as well. Just makes it easier to see what it wants to eat.
Its almost impossible to get a fox to go into a cage trap, so Snares or foothold traps are the best approach. If you have o experience with them, its best to find someone who will trap it for you or call a critter control company.
Do not relocate predators, its illegal in most states and you chance spreading diseases. Once you catch it, you have to kill it.
Calling and shooting also works, download a crying rabbit call for your iPhone, add some speakers and set it up in the direction the fox is coming from. if the fox is close, it will come running. A .22 will kill a fox, no need for anything bigger.
Other option is an outside dog that is chicken-trained.
Or just live with the fact you cant free-range unsupervised.