Does anyone know how this antenna connection comes apart? Is it a twist off or pull out? . I don’t want to damage it. Picture attaché of the antenna connection.

 

Welcome to the Forums.

When that is sorted, please do an Intro in the New Members Area.

Your XJ6 is known as an XJ40 Model. Confusing, yes, Jaguar used XJ6 across many, many models and years.

Most Antenna cables simply pull apart, but the members in the XJ40 Section will know if yours be different. Mine were all the earlier '40's and simply pulled apart.

Good luck.