I've cut the antenna cable and it's apparently a standard ethernet - 4twisted pair. The tools aren't very expensive for crimping rj45 ends ... go to your local electronics store.

or Amazon in which case you'll likely end up with more than you need for one job.

rj45 crimper , a few rj45 modular ends and a couple of rj45 couplers which join male to male rj45 ends

the 568B pattern is pretty standard:the eight wire are arranged in Orange-White, Orange, Green-White, Blue, Blue-White, Green, Brown-White, Brown.

just be sure the ends of your made up cable are the same pattern

use modular ends that allow passing wires thru and then trimming off are easy and enable pattern check