Welcome!

I think the days of external carphone aerials are over. I used to have a Nokia car kit with a holder that connected to the Saab connector and the sharks fin. But that car has moved on and I have fitted a Parrot CK3100 kit in my 2006/7 Dame Edna. No external aerial connection. It works well in all the places that I have needed to use it. Both UK and the further reaches of Europe.
I got the correct SOT convertor lead from Parrot to Saab from
http://www.justcarkits.co.uk and it was virtually "plug and play"

The only thing that was a problem was that I tried to used the inbuilt microphone, but broke the terminals while trying to alter the impedence. So I used the Parrot one in the box.
Details of my install can be found
here. This is a "phone only kit. If you want music via an AUX connection, you will need to provide an AUX socket and connect it to the audio. The most elegant one I have seen is
this one for the Kenwood. There's a similar one for the cars with a Denso system.