Wild cats? People should take better care of thier pets!.... If its wild you have to hunt it..... they get pretty wiley. Place the rrap in strategic locations...... maybe find out where it goes in your barn and set the trap there. Try to hide it so the cat is in the trap as soon as it goes in the barn. I kondof like cats but if all else fails a .22LR or 12 guage works real well. If you don't want to do that throw a bag of liver on the roof of your barn..... when it stinks so bad you can smell it when you walk out the house........ bury it where the cat goes..... it should dig it up and eat it, get sick as 10 dogs and learn its lesson. The liver trick is what I use in the city when all the nieghborhood cats dig up the garden....... feel sorry for the owners b/c if that cat get sick at home they have one hell of a mess to clean...... but hey its law here that all felines be kept indoors, like mine.
Good luck..... hope the TOM learns his lesson B4 its too late