Thanks for all the thoughts. I honestly did not expect the posts of sympathy, kudos to you all for listening to a non chicken owners problems with some mercy
Unfortunately the contour of the land precludes a fence. I am on top of one ridge and the roosters are on another. Our mutual property line is in the valley between. The area where a possibly could put a fence would require one about 40ft high to block line of sound. There actually is quite a bit of foliage in-between us now that the leaves have come out, but the reduction in noise is minimal. I'm not sure if I have the perfect line of sight(sound), or the sound is somehow echoing and coming in from multiple directions.
The county does have a noise ordinance, but I'm not sure how well it's enforced (I'm finding out now that the previous owners called the police on at least a dozen occasions on account of the noise). I'm also hesitant to make enemies of a new neighbor.
I do believe they are cared for, although I hate to see the each rooster chained up next to their little kennel. It seems a terrible life for them, although I understand that if let to roam they would quickly take to fighting each other with bad consequences.
We have already thought about moving, but we literally just moved in 5 months ago, so it's not financially feasible at the moment. I even went so far as to offer to write him a check if he was interested in starting a different business venture, or even to move them (he has 17 acres), but no bites so far. He compared his chickens to having dogs, so I guess I didn't realize the passion behind this hobby
@lazy gardener Your neighbor was just actually certifiable by that time and you just didn't realize it
I myself have caught myself crowing back and I'm not sure exactly why I do it, but it ain't love
-plumcrazy