Umm...I think you may be right. The HAVA box can be used as a tuner as well as streaming. I have a tuner in addition to the have box. If you do not have a tuner on your computer, yes, you do need the hava box then. Meritline.com or newegg.com, they carry USB TV tuner, $30 - 50$, if you need one. Bottomline, if you have your own tuner card, orb will stream your TV signal. Changing channel is a totally different subject! Get TV streaming signal 1st, we then talk about changing channel. There are ways to change tv channels depends on whether using a setop box

bun