Does anybody have experience with network extenders? Would it help preserve battery life in poor signal areas? Also, has anybody used Sprint's Airave network extender? I get terrible service here in college, but back home (Suburban Chicago) Sprint has great 3G and even WiMax. My 2-year with Sprint is up in October, and with the EVO 4g coming out (+WiMax back home) I was wondering if an Airave would help my reception woes during the school year.