I used eight lengths of dirt-cheap (from the home-improvement big-box store) Cat5 UTP (unshielded twisted pair) to extend the direct outputs from 32 channels of the house desk through 120 feet of metal conduit to the line inputs of the video/broadcast/recording mixer.
The house desk is a big 36-channel Soundcraft with "fake" (impedance-balanced) balanced direct outputs. The media mixer is a cheap 32-channel Behringer thing. The TRS balanced Line Inputs are almost certainly just padded-down and fed into the transformerless balanced mic input circuit.
I used these adapter gadgets (~$2 on Ebay) to transition between the 8P8C ("RJ-45") network cables and the break-out ordinary audio shielded pair cables out to the gear.