Stereo Antenna Harness Adapter for Installing a New Radio Into a KIA, Soul, 2010, 2011 Antenna adapter for installing a new Radio into a KIA SOUL 2010, 2011 CarXtc adapter plugs directly into the antenna wire beyond the radio found in a SOUL Plugs directly into your vehicle radio antenna harness behind the factory radio. Antenna adapter is needed for your KIA SOUL 10, 11 If installing an FM modulator you will need this and the reverse antenna adapter