> Would you mind going into a little more detail about what each color represents. It's a simple density plot of an electromagnetic field in which the brighter

> Would you mind going into a little more detail about what each color represents. It's a simple density plot of an electromagnetic field in which the brighter colors represent constructive interference and dark areas represent destructive interference. The three antennas constructively or destructively interfere, with varying effects at different locations within the field. I want to say again that the diagram is only an example and uses a frequency much lower than that used by cellular systems, just so the lobes are a reasonable size, and only to give some idea of the principles at work. > Intuitively, the diagram seems to say that behind (in front of?) each blue dot (antenna) the signal is really strong while on the other side it kinda drops down, only to strengthen again when we hit the middle of the triangle. Yes, that's true -- the three external lobes happen to be places where the three antennas constructively interfere. One can do this using pencil and paper (as I did when I was a NASA Space Shuttle engineer many years ago, and before there were personal computers), but computers make it much easier to experiment with different configurations. Here's a different antenna configuration, one that I doubt anyone would want to build -- a circle of antennas, giving circular intensity lobes: http://i.imgur.com/hK9BZnF.png http://i.imgur.com/hK9BZnF.png Not very useful, but interesting.