Yes, most DIRECTV NOW programming streams in HD. If your Internet connection or bandwidth can't support HD, the video quality will automatically downgrade to ensure the best viewing experience.
Mobile streams on a smartphone or tablet may be limited to 480p standard definition when viewing on a mobile network. Wi-Fi connected devices can play in 720p. For more information, see Recommended Broadband Speeds.
DIRECTV NOW streams On Demand content in Dolby Digital 5.1 on Apple TV devices.