Even if you upgrade to a better tuner, you will need a decent antenna, so I would start there first. Check out the following website for guidance on indoor antenna selection:
http://www.gcaudio.com/resources/howtos/antenna.html
There is a link on that page to Magnum Dynalab, the Canadian company that specializes in FM tuners. They make pretty good indoor antennae. I have the cheaper ribbon one myself, but the long whip one is better. I get poor results myself from cheap, amplifying antennae which just increase both the signal and noise level and do a poor job of noise rejection.
http://www.gcaudio.com/resources/howtos/antenna.html
There is a link on that page to Magnum Dynalab, the Canadian company that specializes in FM tuners. They make pretty good indoor antennae. I have the cheaper ribbon one myself, but the long whip one is better. I get poor results myself from cheap, amplifying antennae which just increase both the signal and noise level and do a poor job of noise rejection.