I bought this item early in August, and although I was slightly bummed that it does not sound as "crystal clear" in the car as I had hoped, it did have some decent frequency in certain areas (if you're in the L.A. area, you'll likely be bouncing between 90.1 FM and 90.5 FM, and maybe even 90.9 FM too)

I recommend using the channels that have the most frequency (fuzzy noises), usually below the 100 channels

Overall, however, this product was good to me (and who knows, maybe I was just lucky I was able to find a good frequency... especially by placing my iPod upside-down in my lap seatbelt as I drove), but just so you know:1

You can find a good unused frequency by finding the frequency with the most white noise, but if you don't want to do that Griffin has created a website to help people find an unused station here

Don't think it can find a good frequency on its own