Amazon has let me know that Fire TV Cubes in the US and select countries will soon gain the ability to switch channels on the over-the-air tuner built into TVs. The Fire TV Cube has always had the ability to change channels on Cable and Sattelite boxes, but now this upcoming update expands that capability to also include changing channels from an HD antenna directly on your TV. Once the feature arrives, and is configured, you’ll be able to ask Alexa to change channels by saying “Alexa, tune to channel [#] on TV.” You’ll also be able to change channels by name by saying “Alexa, tune to [CHANNEL NAME] on TV.”
The new feature will be rolling out to Fire TV Cubes over the coming weeks. I don’t have it yet on any of my Fire TV Cubes, but it seems like you’ll need to go in and configure the feature before Alexa will understand the commands. I’m told that the “Add Equipment” menu under Settings > Equipment Control will gain a new “Live TV” option once the feature is available. That’ll be where you configure the Fire TV Cube to change OTA channels on your TV.