they have threads and can screw on. To connect two cables, you need a double female adapter.
They are cgeap. Can be bought at Radio Shack or some other electronic store.
Rick
How do attach a standard coaxial female adapter on to a standard coaxial cable?
If this is not the best area to post this question please advise..thanks

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic