Wide FM - maximum deviation of a broadcast FM transmitter is +/- 75kHz so the receiver needs a bandwidth of 150kHzor more. To add a 'safety factor' adjacent transmitters are spaced at 200kHz intervals as there used to be a sub-carrier at 85kHz with a low deviation signal on it for 'lift music' subscribers. Fortunately FM has a "capture effect" in that the receiver tends to 'lock on' to the strongest signal ignoring an interfering adjacent one.