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Hello, While i tried to fix some problems of a laptop, accidentally I broke the antenna of the NIC. The wire and the gold prong just broke off. I tried to reconnect putting the wire inside the gold prong and it seems right but, after that, the WiFi Signal is too weak. How can I fix this problem? There is some way to reconnect the gold prong and the wire? Thanks!

Sadly this is a special coaxial wire which is crimped at the factory so you can’t solder it back on. Here’s an engineers product guide for them: Micro Coaxial Connectors for WiFi & Bluetooth antennas. You might be able to get a few samples from someone and very carefully put on a new connector. Just make sure you measure the one you have so you get the correct one.