What does this coaxial cable do?

[The Radium King]

argh, i hear you. had the seats and carpet out to fix the little hose that runs washer fluid to the rear hatch, replaced the two front suspension airbags, just got the compressor repair kit in the mail to fix that, replaced one door lock mechanism because of a sticky door switch (two more to go ...) flushed the heater core but have to have another go at that to get the heater working better, have an exhaust gas temperature sensor to jumper, replaced two injectors, two front axles, the g65 sensor is throwing a code (hoping just need to top up refigerant) and also getting a transmission gear sensor code that everyone in the audi internet world seems to get and no-one has a soln for. nice car though.