These are some quick instructions that really need further expansion. But I thought this should be documented somewhere.

At least in Ottawa Canada, all of the channels I can receive with a TV Antenna broadcast audio description, and are in HD. Unfortunately, no current TV supports switching to the described audio track when using an antenna. But if you want to pick up the audio description, there is a solution!

The First Thing You're going to need is an $1. This is a small device that connects to a TV antenna, and to your home network, so any device on your network can pick up TV signals. It's super easy to set-up; it's almost plug and play! Make sure you get the HomeRun connect, though. The Extend and Prime models compress the TV signal, and as a side-effect, remove the audio description track.

Once you have the device, and have plugged in internet, power, and your TV antenna, the only thing you need to do is scan for available channels. To do this under windows 10, open file explorer, and select "network" from the tree view/sidebar. Once the list of network devices has loaded (this might take 30 seconds or so), you should see a device with a name that starts with "HD Homerun". Press enter on this device, and your web browser will open. On the page it shows, choose "channel line-up", and then press the scan channels button. Scanning for channels takes 1 or 2 minutes, but the web page will tell you the percent complete and the number of channels it's found. After the scan finishes, you'll get a table showing the channel number/name/logo of each channel you can receive.

Now that the device itself is all ready to go, you'll need to download and install $1, if you don't already have it. Once VLC is installed, find a channel you want to watch on the channel line-up page of your HD Homerun, and press the applications key over, or right click on, the channel number. In the menu that comes up, chose "copy URL to clipboard" (or similar, depending on your browser). Next, go into VLC, press ctrl+n, paste in the URL you just copied with ctrl+v, then press enter. If all went well, you should start hearing TV audio. Now it's just a matter of going to audio on the menu bar, going into the "audio track" menu, and choosing the appropriate audio track. At least in Canada, this is usually called "Track 2 Visual Impaired commentary" or "Track 2 ENN". If audio description is available, the rule seems to be that it's always the even-numbered tracks. For example, track 1 is regular audio, track 2 is audio described English, track 3 is regular French audio, track 4 is audio described French, and so-on. Well, I've only seen one station offering 4 audio tracks; most only offer 2, so I don't even know if more than 4 is even possible.

Thus far, desktop VLC is the only player I could find that will allow you to select the audio description track. The IOS and TV OS versions of VLC will work with the Homerun HD, but for whatever reason they only show the picture, and won't play any audio at all. The Channels App for the Apple TV won't allow you to select the audio description track, and doesn't respect the audio description setting in accessibility. Kodi works fine with the Homerun, but won't allow you to switch audio tracks, as far as I could tell.

So, at the moment, this is kind of limited. But it's better than nothing, and it does prove that Canadian broadcasters are broadcasting the audio description track over the air. Now we just have to convince app developers (other than VLC), TV makers, and so-on, to support it.