In order to broadcast your PC using this device, you need either a video card that has a composite video out or a VGA to TV scan converter. Watching TV or video shouldn't be the worst, but if you are thinking that you are going to surf the web on your TV with any kind of clarity forget it. An NTSC composite video signal is 480i at a 4x3 aspect ratio which is a very low resolution (480x360). If you are going to try to take a computer signal with a resolution of even 800x600 ,which is low for computer standards these days, and compress it to a 480x360 picture, you are going to loose a lot of clarity. Imagine compressing an XGA @ 1024x768 image or god forbid a UXGA @ 1600x1200 down to the 480x360. You don't notice this as much with a video image, but anything with defined lines will look terrible.
Bottom line is though that you need to convert the computers higher resolution signal down to the NTSC signal level.
Hope that puts some of it into perspective a little
Dan B.