I'm just changing my living room set up as I just got a 40V4000. Unfortunately the current RG6 cable I have is too short for the new set up so what I've done is I swapped this cable over with the one used for my TCL cable modem which I've had since 2003.
Surely TCL cables are decent? I will eventually get an appropriate replacement such as a Belden quad shield or something but in the mean time, can I do this?