Are there any cat rescue groups in the area? Or "Alley Cat Allies" - they do trap, neuter, release. (TNR) He probably wouldn't be wandering so much if he was neutered and he would be more friendly. The local humane society here occasionally has a spay/neuter clinic where people can bring their barn cats for minimum cost, I think $5 ea. They also give rabies shots. It's been really great for the horse farm where I work. We love our barn cats but they have to be neutered - keeps them from wandering & fighting so much. I know this cat is not your responsibility in any way but he is being a nuisance and there might be some outfit locally that can help. Wish I could think of something more useful to do.