To the best of my technical knowledge, if your listening to a simulcast system, there is no way to tell which tower your listening to. They are all on the same frequency and transmitting the same information.
You just need to know what the control channels are and scan those. Audio distortion will occur in the tower overlap zones and a directional antenna will help. If the audio delays were not set up very well, the audio distortion you get is hit or miss.
Depending on where you are in the state, you can find either good coverage or marginal coverage. If you were in St. Tammany Parish, there should not be any place in the Parish where the signal level is poor, except inside some metal buildings. There are 8 towers now in the Parish that provide great coverage.