Need a CB for Alaska

We will move the motor home from our pad to Wade’s RV in Sapulpa, Oklahoma tomorrow morning.  We have an appointment with Wade’s to install a CB in the motor home.  The motor home has an antennae that was installed at the factory but did not come with a CB when we bought it.  I have tried to find the coax cable that appears to be attached to the antennae but I can’t find it under the dash.  Also the top of the antennae, the whip, is gone.  I guess since it is gone and the regular radio whip on the other side of the motor home is also gone that someone at the factory didn’t tighten the allen screw that holds them.  We have always just used walkie talkies when traveling with other RVer but feel like it would be good to be able to talk to other people further away when we are going across great distances in Canada and Alaska.  We need to be at Wade’s at 8am tomorrow so we are planning on leaving here about 6:30am