Continuity problem with coax

fpresto is correct on his analysis of coax, although the RG-59 used in MOST installs is about the worst junk around. Copper coated steel wire, ultra soft dielectric that allows the center wire to move around and cause ALL KINDS of issues so strange you would likely never put your finger on whats going on Google "Periodicity"). And a shield you can drive a truck through. As he says, if you know what to look for, in these short runs, the differences in loss can be hardly noticeable.

BUT.. if doing a clean run, buy GOOD RG-6 anyway and you're that much further ahead.