Is there a way to broadcast my Internet radio station to AM/FM radio?
you need separate equipments for that if you want to broadcast it within a vast territry ,,
but if you want it to play with car audio system or another fm receiver within a hand throw distance then several nokia phones have a build in fm transmitter ,that can be used
If you want your entire town to hear your station you're going to need expensive broadcasting equipment and (assuming you don't want to be shut down by the government) a license to broadcast. You'll also probably need a team of lawyers to work out the rights for all the songs you play and a lot of other things.
If you just want to do this in your own home, however, there are simple devices for the job. The range isn't great, and they're mostly intended for car users who can't plug devices directly into their stereo. For example:
What Mike says, is pretty much everything to say but, I would add something...
There may be in different places, that a part of the frequency, it's for free..
Sorry, not free, partially for free.. You can get this license very easy, and maybe without paying so much, but you have to describe your channel details and some more details and so on! Also you will get a certain FM Frequency, so that other ones don't cause interference in that channel.. (Based from Computer Networks that we studied at school..)
Also, here in my place, a priority is that you have an university degree, related to communications branches... (Maybe for example, you are a journalist..)
Anyway, go and ask to the proper legal office for this... (at the place you live, of course).
In general all you need is a FM transmitter however there are legal boundaries. Pretty much all radio frequencies are controlled by some government institution.
For example in the US you are not allowed to transmit on FM without a licence from the FCC. Even the low power FM (LPFM, 100W ERP or lower, ~30m/100ft) is limited to "noncommercial educational entities and public safety and transportation organizations, but are not available to individuals or for commercial operations."