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have you plugged in the blue antenna power cable? it needs to be connected to the iso harness, but isn't in the joying iso harness as standard. you will have connected the antenna, but it needs power to amplify too.
i've not done it myself so i'm not 100% but the blue cable is separate, and if you look at the factory harness there are extra pins which i believe are supposed to connect to it.
Visited my installer last week and he connected the Blue antenna power cable to the OEM ISO harness, now FM worksRadio works on mine by default, it will pick up channels and I can hear it but the quality and signal strength isn't great. To be honest I never used it with the stock alpine unit so I can't remember what they sounded like to compare. I think it needs the amplification Sparky talks about if you want to use it often and reliably but I'll probably just leave mine.