I said 11" dogrun (not 15",too high)
A wire wont work inside the pipe but will work on runs going to the pipe.A fox will fly down a 6" pipe and smaller!
Ime based near middlesbrough (cleveland),where are you dogrun?
Snares are the answer but to be honest you really need to know what your doing to be able to miss the billies.Every run and part of run are so different that each and every wire may be set differently!
Forget about lamps,evening and morning squeeking is second to none