it's unlikely, especially given the constraints of FM broadcast. in theory, you could run the FM signal into an AtoD converter that could then be run through a processor to add some shaping (EQ) and whatnot at high rates (eg: a Meridian 518) to net you a better master, but it seems like a lot of expensive work to go through for what will IMO be minimal, if any, improvement of the sound quality. my two pennies fwiw.
