[subhumanderelict]

The 2.4GHz antenna shouldn't work at all considering Sprint operates on 1900Mhz (800MHz when roaming, I think). As for the building being metal, I'm not sure if that would matter. I mean, metals do tend to screw up signals more than other materials of comparable size, but if you're still getting some signal, that means no more is being attenuated than if the building were made of some really thick dielectric. Agh... I gotta look back at my communication electromagnetics book to check this.