Originally Posted by TonyBDA
the RG designation on coax cable means "Radio Grade"...it's for unbalanced RF signals. CatV is not.
Balanced or unbalanced refers to baseband audio. This is completely different from modulated carriers, which typically all RF is. Once modulated, there is no way to determine if the original baseband audio was ever balanced or unbalanced, or what the original polarity might have been.
Coax is a transmission line, and shielded to avoid direct ingress (which can cause antenna-like behavior) which Cat5e is not. There is no need for "balancing" a signal on shielded cable, as the shielding prevents ingress and therefore any need for phase cancellation. Coax appears as an infinite chain of series resistors and parallel capacitors, giving it a characteristic impedance that allows modulated RF at that same impedance (which is never characterized as "balanced" or "unbalanced") to present it to the load without reflecting back to the source, somewhat like a waveguide.
You would need to convert to a transmission protocol, like TCP/IP, not to mention some sort of modem or transmit and receive modules, to push sat radio over Cat5e sucessfully.