radio flash help

[faroreefer]

first off, if this is in the wrong place sorry. I flashed the newest alltel radio to see if it would improve the signal in my area (Bell Mobility). After flash I could not get any signal at all, so I flashed back to the sprint 1.11 I have signal now , but very weak. I have flashed the sprint shipped rom and flashed back to the bearbonz 4.1 Rom that I was using previously and still the same problem...am I missing something or am I doomed???