This device is not a radio receiver and has no external aerial. It is only used to play music (from mobile phones, tablets, etc.) on an existing car radio. To do this, you search for a free FM frequency on the car radio and set it on the device. The music is sent from the mobile phone to the device via Bluetooth. More modern cars have had this function built in for a long time and do not need this device.

No. It doesn't come with an aerial. But it's not worth anything. I have sent it back.

No, it does not come with an aerial. The transmitter is not a DAB+ device.
The music is sent from the smartphone via Bluetooth to the S-09 Lite transmitter, which in turn sends it to a free FM frequency on the car radio that you can set.
You play the music from your smartphone via the apps you have installed (e.g. Spotify or Apple Music or radio apps).
If you have installed a radio app on your mobile phone (e.g. SWR3 or PlaySRF), you can of course also play the corresponding radio stations via the mobile phone, the connected transmitter and thus via the car radio.

No, I assume the aerial is installed. It works in any case.

No, schneid has explained it well! It's a good product