limbot
2
Yes you can, see below picture (stolen from @Johnex
)

PCI-E modem on the left with the two antennae wires.
Best would be the “new” global modem EG25-G .
Think you need to talk to the Gl.iNet guys to get hold of but I do note it’s on their Gl.iNet shop now.
Be careful when swapping out, the uFl connectors for the antennae are delicate 