Usually, when you're trying to find a source of whatever signal, you move around the source and then calculate the position using triangulation. I'm specifically talking about low frequency signals, such as radio waves.
I was wondering what can make this process harder or completely impossible (the former seems very unlikely).
If there were two transmitters, would it be easy to tell that there are two and not one? Could the signal be dispersed unevenly in the area, making it appear somewhere else than it is?