At this time of year, and in view of the circumstances, rub the trap over well with anything 'lamby' you can find - stillborns or afterbirth is what he will be looking for so they would make the ideal, if distasteful, bait for the trap.
Don't leave the trap in the public eye, a site with the trap side against a sheep fence will prevent him circling the trap and good luck - they are hard to catch in cages at the best of times, and with such rich food pickings abounding then you will have you work cut out, but it is possible!!
OTC