For my particular location, I had the best luck with the leaked 4.0.4 radios. I wasn't picking up 4G at all at my house and with 3G I was lucky to be able to get 0.4 down until I flashed the leaked 4.0.4 radios. If you use SBenson's unlock bootloader guide in the development section, it will help you get adb and fastboot set up.
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