No, the tip has broken off - and the remaining 'tube' has slid back inside.
If you can find something thin and threaded, you 'may' be able to slide it down inside the aerial, screw it in the broken tube, and pull it back out - then solder a nut or something on the end. Failing that, solder a nut to the end of the existing tube that is still sticking out, and use the aerial shorter - it will make VERY little difference.
However, far easier to just measure it, and order a replacement one off Ebay etc.