I found this over at XDA. It has helped me greatly. I live in an area where 4G isn't that strong. The 4.0.3 radios improved my 4G signal but hurt my 3G signal. Also, hand offs between 4G/3G were bad. The CDMA radio on 4.0.2 was better so this file creates a hybrid of the improves 4.0.3 radios and better hand offs between 4G/3G.
Instructions for install:
1. Download file below move to SDCARD and boot into CWMR.
2. Flash this file: http://db.tt/8OTJeaKA
3. Reboot your phone, if it has trouble finding a signal on first reboot then simply reboot it one more time and you'll be able to connect.
4. Enjoy the improvements.
5. To go back to your stock radio go http://forum.xda-developers.com/show....php?t=1403133