@marybdvm , it sounds like your guy was calling this summer, possiby to try to find the rest of his flock, or else trying to find female companionship. When my boy got out, he called and the other birds called back, and I think that's how he found his way back to a neighbor a couple houses down, and we got him back in a crate from there, with their help. We are sadly in the city, so I'm sure he was completely disoriented with all the houses and walls and barking dogs and cars... It's a miracle he survived. I do know of a free-range male who managed to call females in from over a mile and a half away, and I've read about birds wandering long distances, either getting lost, looking for love, or other reasons. It's possible he traveled 20 miles or more.
But if your buddy has stayed this long, I think you have a good chance of keeping him around, if you enjoy his company. If you want him to stay, maybe you can find a hen or two for him, and then he won't have as much reason to leave
Other people can give you more advice on this than I can, but if you get a couple of hens (or even hen chicks from this summer's hatch) and pen them in or near your barn, he will probably "adopt" them and stay fairly close. If you keep them penned over the winter, all of them will think of your place as home, and you could let the hens free range with him next summer.
It's not much more work to care for the extra birds, and next summer you will be back to just feeding all the free range birds, and you can enjoy watching your friends from your deck
You can still care for the birds (worming, etc) without catching them -- many people put meds in food so they don't have to catch the birds. Plus you can work towards taming your boy with treats like bread and grapes, and you may eventually get him tame enough that you can touch/handle him.
If you decide you really don't want him around, you could see if some pea person in your area is willing to try to catch him (not sure that would be successful, but it might), or just feed him through the winter and let him look for a new home next summer when the mating drive kicks back in.
Hope this helps, and again, Welcome!