This depends on how it was mounted:

Deck Mounted - Yes: If you used the deck mount with the thread for the Old UFO you can use this for the new UFO X, however the antenna will sit very low and the cable comes in from the bottom not at an angle like the old UFO. Therefore, the cable entry and connection will be tight, but you can use the New Mount over the top of the old one as the new is larger and taller. To do this you will need to remove the old mount and the New one will go over (cover) the old holes.

Mast Mounted – No : If you used the old mast mount which was a metal bracket through the base of the old Mount then the answer is No. You will need to change this mount to the New UFOXMMB which is the UFO X Mast Mount Bracket.

The Antenna comes with a socket on the bottom for mounting to 1"-14 threads – common GPS Antenna mount.