ATSC 3.0, also known as NextGen TV, is the next evolution of OTA broadcasts, and it promises higher resolutions, enhanced audio and interactivity. While these NextGen TV features are still a ways off -- in 2023 the service is in the process of rolling out -- the good news is that it's designed to be backwards compatible with the existing ATSC. So yes, your existing antenna will still work, though you will need an ATSC 3.0 compatible tuner or TV, and an active internet connection for any interactive or on-demand features.