[Lsme420]

Most custom Roms if all don't have a radio in the RUU, and the kitchen does not include a radio either. I would imagine you could find your most recent radio in the FTP site or by downloading and installing your services providers newest update. Custom Roms are kind of hit and miss. Some work better than others but most have small bugs. Best advice I have is read and do some info searching about the Rom before flashing it. If you flash back to stock don't let the updates run with all the bloat ware.
P.s I would say you should always have the most recent radio in your phone.