It's not clear whether the AM will be directional especially if it goes on from a temporary low power antenna site at first. Unlike a directional FM antenna where the pattern is determined by the shapes of the elements on the one antenna, a directional AM site requires at least two towers and is expensive and time consuming to build and test. He may put the AM on the air with a temporary single whip antenna (like WZBR in Dedham uses) just to get it on the air at first. While not directional, it would have to be weak in wattage all around so that it wouldn't send too much power in the directions it can not legally go. If he starts the new 1510 out that way, then he may build a directional multi-tower site for it later on to maximize the signal in the directions it can legally go.