Well in the case of digital cable and satellite, the signal being passed through the Coax cable from the wall is digital, so it doesnt really matter how it gets there, as long as it gets there, within reason ofcourse. What is being fed through a coax for digital cable and satellite is a very different signal than say what normal cable or a vcr is putting through, which is analog, and worse of all, a composite video signal with 2 audio signals pumping through, so its 5 interwoven signals on one wire, pretty messy.