Okay.
In most markets, there's an ION affiliate. The ION affiliates are broken up over-the-air as four subchannels, ION (the only true 720dpi channel out of the quartet), qubo, ION Life, and Worship. They are marked by the lineup number followed by .1 (ION), .2 (qubo), .3 (ION Life), and .4 (Worship). If ION was a local channel in your community, you have the four subchannels over the air. The only way many viewers can see those subchannels is over the air using an antenna connected to a digital-ready television or one of those fancy digital converter boxes that transforms digital signals into one that can be viewed on a regular television.
Most cable companies aren't carrying the ION subchannels, but a few, most notably Comcast, are. So, check your local listings to see if you have an ION affiliate in your area. If you do, then you have qubo on the second subchannel over-the-air.