Hi there and welcome
The 31XM is not compatible with this device, you have to choose from either of these Antennas.
Or the low prodile
You will see current prices there on the links provided and both are available to be shipped.
If you would like any additional information or assistance, please do not hesitate to let me know.
Else if you can take a second to rate my service by clicking one of the stars at the top of the screen then submit, that would be greatly appreciated.