The antenna wire should now stick out to the front or to the rear of the unit (e.g. VT335 has a front hole) just like shown on the picture.
1. Put a washer on the end of the antenna wire thread.
2. Screw the nut on to the antenna wire thread to the maximum with your hands.
3. Now use a wrench to tighten the nut
4. Screw the antenna to the end of antenna wire thread.