Editors' Note: The "Download Now" link directs you to the iTunes App Store, where you must continue the download process. You must have iTunes installed in order to open the link, and you must have an active iTunes account to download the application. This download may not be available in some countries.
FM Radio Spectrum uses a database of US radio emitters and iPhone location services to provide a view of the estimated spectrum utilization your current location. Use this with low power personal FM equipment, music player dongles, or just to get an idea of the spectrum usage in any location. FM Radio Spectrum features offline access, perfect for a road trip where you are in the middle of nowhere and don't have an internet connection but still can't find a good clear frequency, clearest stations are highlighted, and these provide several options that should provide clear reception.