Watch TV on your Mac!
A few years ago, I really thought Elgato products were the solution, but IPTV has really improved since. Joost was never really quite there because it is not live. A new app was released recently. It is Livestation. There are a few channels included with the app that nearly always work and the quality is great. For a better selection, you can search through user streams. The quality of user streams is not as good and they sometimes stop working, but it is one of the only options if you want North American channels. You can download Livestation here from MacUpdate.