Well the daytime is the only -on- shift for a rooster to give hawk protection put up lots of stuff for the hens to hind under- roosters are better at watching then hens but can give the same call.
Have you asked if they mind a rooster? They can be heard about 1/2 MILE away.
If you don't need chicks a secure run and coop is a better idea- less chance of being caught.
Or- all roosters crow, some louder some more annoyingly and some more often then others, it depends on the individual...