Compare the brand new cable run by
The Cable Guy with the little
patch cord linking the
TV to the
VCR. See how the latter is no thicker than a
Mickey D straw whereas the
Cable Guy's is as thick as a
pencil?
Today, with 70+ analog channels, broadband internet, digital cable TV and HDTV(coming real soon now, honest!), RG59 cable doesn't cut the muster anymore. All new Cable TV installations are wired with RG6 which can support the 1GHz bandwidth required by all the new services.
If you've wired your house with RG59, it will have to be replaced if you use anything more than analog cable.
Resist the temptation of using RG59 cable to relocate your cable modem across the room. Cable Modem uplink (from modem to Internet) frequencies are very low (5-40mHz) and most sensitive to interference. You will lose bandwidth speed and probably leak interference into your cable network.
Disclaimer: IANACTT