I found a 10ft thin coaxial cable with BNC male connectors already on each end, a pair of mountable BNC female connectors and wrapped it up with 10ft of 1/8 inch split loom.
Cable 10ft, Thin 3G/6G HD-SDI Cable with Heavy Duty BNC Male Connectors
Saide 2-Pack BNC Female RF Coaxial Adapter Panel Mount
10 FT 1/8 INCH Black Split Loom
Finished it off by adding some red electrical tape and a few little zip ties to each end, similar to how they look in the films.
Now I can trigger the trap at a much greater distance than the short little wire it came with out of the box.