Posted by SnArF From what I've heard I dont think you can use a digital signal on coax cable, you'd probably have better luck w/ s-video or some monster cable, it'll run you about 35 bucks though.
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You're thinking that a square wave is being transported over a coax cable when you order digital TV or internet through a cable company.
To give you the shortest answer possible (I gotta get ready for work), the digital signal gets transformed into an analog signal so that it can travel on a coax efficiently. After you get the signal to where you want it, you convert it back again to digital (hence the cable modems when you order your internet through a cable-tv provider).