If the radio you're using is working and you're flashing from gb to gb, you shouldn't have to worry about the radio. You'll still have the same one. Radios flash separately from roms. I don't think you'll NEED to flash a new radio unless you change to an ICS rom.
Sent from my SAMSUNG-SGH-I727 using xda premium
I'm assuming the problem is more my fault in terms of not flashing correctly. I have no idea whether or not I need a separate radio for this ROM.