The following illustration shows the antenna locations on ThinkPad X1 Yoga Gen 6:
1
Wireless LAN antenna (auxiliary)
2
Wireless LAN antenna (main)
3
Wireless WAN antenna (MIMO1)*
4
Wireless WAN antenna (main)*
5
Wireless WAN antenna (auxiliary)*
6
Wireless WAN antenna (MIMO2)*
* for selected models
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X1 Carbon Gen 10 and X1 Yoga Gen 7 User Guide