I could tell you how to train Bandit to come, but I STRONGLY recommend putting him on a leash EVERY time you take him outside if there is no fence. It sounds like he needs exercise, so I'd find a fenced in dog park, neighbor's yard, tennis court, or anything you can use to get him exercised.

A terrible tragedy could happen if he runs off and you can't catch him. Even if he did come when called, you never know what may happen.