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ls6tt, you do wire this in. You unplug your antenna from your radio and plug it into this device, then plug this device into your radio. It has RCA inputs, so you'd get a headphone to RCA adapter and use that to connect your phone to the device. Now you turn the device on, tune your radio, and u get high quality audio with no interference from outside FM stations. Use one like it for my dad's Sirius, and even on stations where he got bad interference from traditional FM wireless modulator, this thing has absolutely no interference.
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