The signals at the top wouldn't be affected by he radio. You would most likely get them back if you reflashed your from or flashed another. As long as it's a 2.3.5 or 2.3.6. And also follow the instructions (usually pretty standard, wipe data factory reset a few times, wipe cache partition, advanced, wipe dalvik cache a few times, go back, mounts and storage, format system a few times. Then install zip from SD card) oh and always backup first and make sure you can restore the backup. But yeah if you can make calls and use internet, your radio should be OK.
Sent from my SAMSUNG-SGH-I727 using xda premium