Does a "Video to Monitor Cable" exist?

I was wondering, since there is a tv-tuner in a video wouldn't it be great if there was a cable to directly connect the video to a monitor? Does such a cable exist?

Only through an adapter made by STB check their web site for card types

Hold on let me clear up something.... Do you want to interface cable television with your computer? If that is the case the All-In Wonder Pro 8 MB AGP made by ATI (I personally use that one) will do the trick and then some, great card. If you don't want to interface computer to TV e-mail me back and help me to clarify what you are trying to do

I would like to know that whether we can use some adapter to directly connect my monitor to a video source?
OR what is the cheaper way to use my computer to watch video from a video source?
2. What we need (cheapest way) to receive TV with my computer?

I saw a cheap tv card at:
http://www.mpi-pc.com/main.cgi?COMPONENTS
listed in video cards

PHOEBE VCPHTV TV MASTER TV TUNERW/REMOTE PCI $59.00

I don't know if it's any good.