I have a better suggestion.
So you notice you have some FM Stations that don't have an active station (just static).
You can use what is called an FM transmitter to wirelessly transmit your phone's bluetooth directly to the car's stereo via FM station.
Phone --> Bluetooth --> FM Tramsitter --> Car Stereo
https://www.amazon.com/Nulaxy-Wireless-Bluetooth-Transmitter-Smartphones/dp/B018E0I01I/ref=sr_1_4?s=electronics&ie=UTF8&qid=1513669925&sr=1-4&keywords=fm+transmitter+bluetooth