Technical Wiring - Elect Aerial and stray connector

[Barchetta in Italy]

Swapping the non-factory stereo out for a better one and have two questions:
My B has an electric aerial fitted, without having to trace the wire does anybody know if it is in the loom to the stereo or loose somewhere?

Behind the radio was this loose connector, colours are red and black. Any ideas on what it is for? Originates from the loom at the rear right of the radio hole. The stereo wiring comes from the loom at the back left. I can't see any identifier marks on the wire or connector

Thanks

 

[West Coast Barchetta]

The power ant. wire is in the loom that plugged into the back of the stereo, I believe it is light blue "but don't quote me on that"