Clio radio antenna

I have changed the headunit to an aftermarket one in my 2010 mk3 clio but the radio reception is now poor.

I think the 12V feed to the antenna base may have been lost.

I would be grateful if someone could tell me where the antenna gets the 12V feed from to save me having to remove the roof lining?

I assume its one of the wires in the harness plug in the back of the radio but which one?

Clio radio antenna