Dell VH0W5 Owner's Manual page 76

Steps
1. Remove the SMA antenna assembly cables from the routing guides on the chassis.
2. Remove the screw (M3x3) that secures the SMA antenna assembly to the chassis.
3. Push the SMA antenna assembly inside from the opening on the back view and lift it away from the chassis.
76 Removing and installing Field Replaceable Units (FRUs)