[Wingzfan]

hd pro has a coax tuner built in but you need to have a coax jack hooked up to it. Basically without getting into all the details, if you have dish you cant watch one channel on sling and one on your tv because dish requires you to have a box to get channels. The tv tuner can run on a cable coax jack without a box giving you basic cable as well as using the component jacks to run your cable box.

As for orb, I literally just uninstalled it on my pc because I got tired of the constant buffering. Im using a 3 mb upload line and a full signal on my phone and it buffers like crazy. Sling never pauses during playback for me.