Then, an FM transmitter might do the job, as every car stereo has an FM antenna built-in. The Nulaxy Bluetooth Car FM Transmitter connects to your phone via Bluetooth and then sends the signal to ...

Portronics AUTO 10 POR-320, Bluetooth - FM Transmitter in-Car Radio Adapter for Hands-Free Calling, Music Streaming, Micro SD + USB Music, 3.4A Dual USB Fast Charger, Supports All Smartphones ...