Hi oscarjc19,
Welcome to Apple Support Communities. We understand that when you connect a USB-C hub to your Mac the Wi-Fi signal drops. We can see why you'd reach out about this; we can provide some information. What you're experiencing sounds like interference caused by the USB-C hub:
"USB 3 devices can create wireless interference that affects Wi-Fi and Bluetooth devices. Learn how to resolve Wi-Fi and Bluetooth issues caused by wireless interference."
About USB on Mac computers
If you're using USB 3 or Thunderbolt 3 devices with your computer, you can limit their potential to interfere with nearby wireless devices:
- Use a high-quality, shielded USB or Thunderbolt 3 cable with each device.
- Move your USB 3 or Thunderbolt 3 devices—including any USB hubs—farther away from your wireless devices.
- Avoid placing USB 3 or Thunderbolt 3 devices on top of your Mac Pro, Mac notebook, or Mac mini.
- Turn off any USB 3 devices that aren't in use."
Resolve Wi-Fi and Bluetooth issues caused by wireless interference
We hope this information helps!
Best Regards.