Stereo Antenna Harness Adapter for Installing a New Radio Into a Jeep, Grand Cherokee, 2008, 2009, 2010, 2011, 2012, 2013 Antenna adapter for installing a new Radio into a JEEP GRAND CHEROKEE 2008, 2009, 2010, 2011, 2012, 2013 CarXtc adapter plugs directly into the antenna wire beyond the radio found in a GRAND CHEROKEE Plugs directly into your vehicle radio antenna harness behind the factory radio. Antenna adapter is needed for your JEEP GRAND CHEROKEE 08, 09, 10, 11, 12, 13 If installing an FM modulator you will need this and the standard aftermarket antenna adapter