Broken antenna connector on Up2Stream Mini V4

Hi all!
I bought an Up2Stream Mini V4 board some times ago. Today i noticed that it can’t connect to my wifi anymore. I opened my speaker kit and i found that the antenna connector of the mini was stripped out.
I could solder it to the board if I only knew where to connect the two wires.
I can solder one of the two where the connector was previously located (the ground i suppose), but I see the other should be soldered onto a mini SMD component and I certainly wouldn’t be able to do that . Any advice on that?

Photo attached. I think red is the gnd. Where to solder the signal?