I no longer have AT&T 3G network coverage ..

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I have a Rogers G1 that I use with AT&T's service. When I first received the phone (yesterday), AT&T's 3G service was working fine and it even had an option to enable|disable the 3G signal in the settings. However, after I decided to flash the SPL, radio, etc. (after everything, I've decided to stick with Cyanogen 4.2.14.1), my 3G signal no longer works, as I only have EDGE coverage AND there is no setting in the phone that even mentions HSDPA or 3G enabling. I know it's not the ROM that did this, since I was using the Expresso, MLIGN's 3.3 and another ROM. So basically.. How do I get my 3G signal back??? Thanks in advance!

My current G1 info:

DREAM PVT 32B ENG S-OFF
HBOOT-1.33.2005 (DREA21000)
CPLD-4
RADIO-3.22.26.17
Apr 20 2009, 15:30:43