Here are all of the radio images that are currently available for the Note 2. These are packaged for flashing in recovery (CWM/TWRP). I'm posting these here because apparently the other images are all offline or unavailable anymore. I make no promises about these working, improving signal, or doing much of anything, but they're here anyway. If you need to know how to use these, flash your phone to stock and leave it locked, I'm not here to support stupidity. Enjoy.
VRALJB Modem
VRALL4 Modem
VRAMC3 Modem
VRUEMJ9 Modem
VRALJB Modem
VRALL4 Modem
VRAMC3 Modem
VRUEMJ9 Modem