It's really easy to implement on your own. You just need any cable that is 75 ohms and pretty consistent impedance across the whole cable, and each end of the cable is terminated with a 75 ohm resistor between the + and ground (don't quote me on that). Belden has lots of good wire options, their 1694 is rated at 75 +- 1.5 ohms across 1000 ft which is pretty darn consistent.