How far the sound travels depends on a lot of things, but some crows can be heard for miles around. How far away are your neighbors? Unless you are on a farm and your neighbors are spread very far out, chances are they will hear your rooster, and so will you. Whether that's annoying, really depends on the person. Some people are annoyed on principle. Others are more sensitive to sounds or irritants. Me personally, I'm not annoyed at all. I used to sleep with the windows open and not hear our rooster in the back yard at all, while my mom had to sleep with ear plugs in. I have my own flock now and don't have a rooster because my neighbors complain. People are different. Best to go talk to your neighbors and see what they think about it, and have a plan B in case they don't want to live with the sound. Check your town bylaws, too, to see if there's anything specific about roosters.