This is a working GPS antenna from a Furuno system. It has the threaded plastic mounting base, but it looks like someone over tightened it marring the threads a little and cracking the base a bit. It will still mount and stay in place. If I were going to use it I would take some PVC glue and flood the crack for adhesion and water tightness. The cables has been cut, but there is a length of cable to splice it back together during install.