Belkin has unveiled a new tool to help iPod owners locate the best FM radio frequencies to use with FM transmitters on-the-go. The service, titled "My best FM," works only in the U.S. by enabling users to enter a zip code to discover which FM frequencies are the clearest and most suitable for use with devices such as Belkin's TuneBase FM for iPod. "My Best FM" searches a comprehensive database of FM radio frequencies and lists those with the clearest transmissions in the specified area. The service is already available on Belkin's website, and is available for free.