Stock ROM= Horrible signal but CM10= Adequate signal?

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http://forum.xda-developers.com – I have tried everything from updating PRL and Profile on stock. I get nothing. Used to have excellent 4G now I don't even get to roam. Any ideas as to what's causing this? P.S. My brother's iPhone 5 has great service and we live in the same house. Thanks in advance! Sent from my SPH-L710 using xda premium (HowTos)