Neutral is provided by the power company as a return for power provided and included in the feed to your building. Ground is derived from grounding at the building and almost always connected to neutral at the AC breaker panel. Except for some systems in Canada, eh, where I've seen a single wire feeding a residence and the return was provided only by a ground rod at that residence. Pretty scary but its working for them.
Separate grounds have been a topic in this thread where it appears a tower has its own ground rod derived ground and the house has its own separate ground rod derived ground and they are not connected. I don't think that is legal per NEC if there are other power lines between the tower and house or if there are antenna feedlines from the tower feeding the house.
