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I’m looking to replace the wifi antenna on my iPhone 5s, but I cannot find a tutorial for this job! Any kind of tutorial would be great. Thanks in advance.

If you look at the following guide in step 27 and 33 it is said to remove two different antenna cables. One of those must be for the Wifi. One antenna seams to be on the lightening modul. If you look at this guide for replacing the rear case iPhone 5s Rear Case Replacement You can see the antennas in the picture of step 71 and 63. Hope I could help you.