Whether you are replacing your factory car radio or installing an fm modulator in a vehicle that does not use standard antenna plus then you need an antenna adaptor. We have an antenna adaptor for every vehicle, we also have a an fm modulator antenna adaptor kit for every vehicle. We carry tons of Metra antenna adapters that allow you to connect your factory radio antenna to your new aftermarket car stereo all without cutting a single connector. We have an antenna adapter for every vehicle.