for ethernet cable <100 meters. You will see no difference in either scenario. But RG6 will be a better conduit for your cable signal.
Which would perform better in a network ? A long section of rg 59 to the cable modem and a short section of cat 5 to the router or a short section of rg 59 to the modem and a long section of cat 5 to the router. I'm not really looking at great distances something around 3'min to about 20' max.

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