Best external ATSC 3.0 tuner boxes

Start with the ADTH NextGen TV Box Gen 2. It's the most complete box-style tuner here: it handles both ATSC 1.0 and ATSC 3.0, outputs up to 4K with HDR, and decodes Dolby Digital Plus/AC-4 audio — the audio codec that trips up cheaper boxes. It's the one to buy if you want a plug-into-HDMI box with a remote and no extra gear.

Who the others suit:

• SiliconDust HDHomeRun Flex 4K — best for a whole-home setup: four tuners, encrypted-channel tuning and DVR to a USB drive, but it streams to your devices rather than plugging into a TV.
• Zapperbox M1 — the pick if you want a polished box with DVR and encrypted NextGen channels and don't mind paying the most.
• ADTH X23A3U — a budget single-tuner ADTH, but it's an older generation and the listing is pre-owned.
• GTMEDIA X1 — a cheap Android box with ATSC 3.0 and AC-4 audio if you also want streaming apps.
• HDHomeRun Flex Duo/Quatro — fine for ATSC 1.0 network tuners, but they're 1080p and not NextGen.

Skip the no-name sticks and the oddly priced GTMEDIA set-top box; support and firmware are the weak point on those.