How do you get the Homebrew channel on the Nintendo Wii?

Technically, it is possible. WAD Manager, an app for wii homebrew, installs .wad files on your wii. These are pretty much wii channel files. It normally is used to install wiiware or VC games on wii, downloaded from the internet. It is also used to boot wii games without the actual disc. I can't tell you where to get the file, though.