What ^ said. The tuner is in the rear passenger side quarter panel. There is also a second connector 6 inches from the antenna. I just removed mine 30 minutes ago to install a MIMO LTE / GPS antenna for a mobile internet router. Here is the new antenna installed. Built by Antenna Plus.

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2006 Jeep Liberty Limited CRD (purchased 10/30/12 w/ 52k miles) GDE HotTune & Eco TCU, Suncoast TC, Amsoil Full SAPS (EFM) 5w40, Amsoil ATF, 7" touchscreen Android powered stereo (direct from China) w/ 4G LTE mobile data for streaming Netflix, HBO GO, Slingbox, Pandora, etc.
