FM operates at much higher frequencies than AM radio but the channel width used to transmit the station is close to the same. (+/- 5kHz for AM, +/- 15 kHz for FM) AM band is measured in kHz so +/-...
FM broadcasts need an FM radio receiver. Either a fixed receiver in a stereo system or a portable radio will do the job. FM has a limited range, typically 40 to 50 miles from the transmitter is close...
Well first of all, AM radio stations r local Music, FM radio stations r Worldwide (i think...) and if not they r just in a surrounding area. That is why we have both AM and FM radio Stations.