Attaching gigaware antenna kit to linksys wrt54g...

Question

I am trying to get my Gigaware 25-162 antenna kit onto my Linksys WRT54G wireless router.

How do I get the current antennas off of my linksys router so I can put the new ones on?

Many comments say 'Easy to install'.
It does not look like my current antennas unscrew but maybe they do.
Please help
Thank you. Pat