I have had a very annoying problem with my 2007 Prius radio. I listen only to FM, and there are many FM stations in my area, but NONE of them come in clearly in my Prius. I have the premium JBL radio, the FM stations sound great in my other 2 vehicles, but they are unlistenable in my Prius. CDs in the Prius JBL radio sound great, so it is not the amp or speakers. The dealer has swapped out the radio, but no improvement. He says all Prius radios are the same. Could it be?
The FM reception in the Prius is the worst of any car I have ever owned. I use my iPod a lot more now.
The Prius radio is using digital-tune. Can't you try to manually tune one of the FM stations frequency you familiar with and see how it sounds? Below the touch screen display, the radio has 2 circle turn-nods. The one on right-hand side can be used to tune radio station manually. Avoid using the Seek function on the radio if too much interference presents.