If your wireless card doesn't work on macOS and there's no kext to fix it but don't want to replace it, here's how to get wifi. (Must have jailbroken iOS device)

1.) Have jailbroken iOS device (not entirely sure if iPods/iPads work for this but you could try)

2.) Buy and install Tether me from Cydia

3.) While connected to WiFi, go to your settings and open the TetherMe preference panel

4.) Turn on hotspot and override data source to WiFi

5.) Connect phone to computer via USB and you should have WiFi

I have just as good of speeds as I do on my phone or on windows where my WiFi card actually works.