I'm going to assume you've got a PL-259 connector on the end of the coax cable - they look like this:
They are designed to screw onto the radio's RF / Antenna jack. The end shown is standard, the other end - that the cable enters, requires an insert that matches the coaxial cable outside diameter.
There are two versions of the connector; solder-less and soldered. The best connection is provided by the soldered type. It is superior both electrically and mechanically to to the solder-less version. If you lack soldering skills, patience and / or the tools and supplies to solder the connector, the solder-less version will be the way to go.
There are two types of solder-less types, a crimp and non-crimp type. They look like these:
The "Non-crimp" solderless PL-259 from Radio Shack
- about $6.
A crimp type PL-259 connector - $2 and up at various radio & electronics stores.
Since this end of the antenna is at the radio and presumable protected from the elements, it may prove to work very well for you. Each of these connectors requires knowing the type cable (RG-58 and RG-8 are very popular types - but there are many other 50 ohm coax cables) or outside diameter and selecting the one that fits correctly, along with a crimping tool (and dies) for this particular connector size. You may get by with a standard pair of pliers, but the connection is not as good as would be obtained with the crimp tool. Generally, you would provide a crimp around the ferrule at the cable end for the braided conductor and another at the very tip of the connector for center conductor.
Each connector will include very specific cable preparation steps for the removal of insulating jacket, braid and dielectric material to provide proper fit of the connector to the cable. If it were a "standard", I would have included it.
Check this link
for Youtube video the show how to install the various types of PL-259 connectors on cables.
I hope this helps & good luck!