So from another thread here:
it was mentioned that on the AC 8265, connector 1 is for wifi + BT and connector 2 is just for wifi. Is this the same for the 8260NGW?
You're correct. This is accurate for all of our current adapters.
Antenna 1 (AUX): Wi-Fi + BT
Antenna 2 (Main): Wi-Fi
I'm glad you the notification and were able to make the switch.
If there's anything else we can help you with, feel free to contact us again.