& Welcome to the forum.. as you can see.. it's often a knowledge buffet 'round these parts.. and very seldom ala carte. --that being said:
<> GriffenTechnologies has a 'radioshark' that's fairly promissing but no one has written a review of it's performance in the automobile-environment.
<> D-Link discontinued their best effort (many say great unit, lousy antenna)
More often than not.. folks are having difficulties w/ reception and sound quality in an auto-environment.
&&& to keep things difficult.. many are holding out for RDS (radio data thingie (song titles and such in data format along side the FM signal) There are some efforts being tracked on this site regarding some home grown stuff.. lots of promising efforts.