It's the tiny rectangular blue "chip" thing in the upper right hand corner of the photo labelled WTC. It's a "meandering wire" ceramic substrate monopole antenna. This isn't the exact make and model, but it's the same type:
Unsolder the blue chip antenna. Use TWO soldering irons like a tweezer. The trace near the point labelled A1 is the center conductor of the coax. The large ground area nearby is to the shield. Keep the exposed center conductor of the coax *VERY* short.
You may need to add an isolating series capacitor if the antenna has DC applied to it from somewhere. I can't tell from here.
If you want to be crude, cut two pieces of stiff copper wire to 31.1mm long. Solder one to the hot lead (one end of L7). The other to ground on the opposite side of the board. Instant dipole. Not great but much better than the original chip antenna. Add a reflector and you have a possible dish antenna feed.