"it doesn't compress the signal in any way"
What exactly does that mean in this context? They're taking an analogue signal from a copper wire and transmitting it as a digital signal over the ether (a particularly busy part of the ether at that). At some point they are going from analogue to digital and back again ... unless they (or you) tell us what that A to D stage is and how reliable that (proprietary?) wireless link is then the rest is meaningless. They could sample the analogue and transmit it at 100 bps if they liked ... it would sound like absolute toss but they could still quite honestly say "it doesn't compress the signal in any way".