If you keep calling them then scaring them off at night you are giving them a good education and they will stop coming to a rabbit squeal or any other call. Ditch the cross bow for night hunting and at least use a shot gun with # 4 buck.
We go into an area where we have seen or heard coyotes( they howl like pet dogs to sirens) in the late afternoon or very early morning. Set up our call and our selves and only call about 20 minutes to a half hour at the most. If we haven't seen any thing in that time We leave and go to a different place several miles away.
Al