What the maker puts in writing
- “NEXTGEN TV ATSC 3.0 + ATSC 1.0 TUNER IN ONE BOX – Advanced over-the-air TV receiver supports both ATSC 3.0 (NextGen TV) and legacy ATSC 1.0 broadcasts… TV antenna required”
- “UP TO 4K HDR TV TUNER OUTPUT – Supports up to 4K resolution with HDR… on compatible NextGen TV broadcasts and 4K TVs (broadcast availability varies by location)”
- “64GB BUILT-IN STORAGE WITH DVR RECORDING & PLAYBACK – 64GB of onboard storage comes ready for DVR use right out of the box — no additional accessories required… Expand recording capacity further by connecting external storage (USB flash drive or microSD card, sold separately)”
- “DOLBY DIGITAL PLUS & AC-4 AUDIO SUPPORT – Compatible with modern broadcast audio formats… Smart TVs required for this functionality”
- “WI-FI & BLUETOOTH ENABLED – Dual-band Wi-Fi and Bluetooth support firmware updates and future NextGen TV enhancements”
ATSC 3.0 is the only thing on this shelf that decides the future
ATSC 1.0 has been the United States digital broadcast standard since 1998. Nine of the ten boxes here use it.
ATSC 3.0 — NextGen TV — is the successor. It carries 4K and HDR, and it receives more reliably in difficult locations because its modulation scheme is more robust. Broadcasters are transitioning station by station, and when a channel moves, a 1.0-only tuner stops receiving it.
This box has both tuners, so it keeps working either way.
The honest caveats: ATSC 1.0 is not ending on a published date, most markets still carry both, and the 4K bullet attaches its own — broadcast availability varies by location. So a cheap 1.0 box is not useless today.
But the direction is one way, and on this shelf only Mediasonic at $39.99 is candid enough to state the limitation it shares with seven other listings: “This Box does NOT support ATSC 3.0.”
Sixty-four gigabytes, and the reason that is more than it sounds
64GB of onboard storage comes ready for DVR use right out of the box — no additional accessories required.
At typical over-the-air high-definition bitrates — roughly 8 to 12 megabits per second — that is somewhere between twelve and eighteen hours. At 4K, considerably less. Expansion is by USB flash drive or microSD card, sold separately.
What matters is not the capacity but that nothing else is needed. Every other recording box on this shelf requires an external drive first, and two listings show why that is a real obstacle:
ZJBOX names its filesystem — FAT32 — which caps any single file at 4 GB, roughly forty-five minutes to an hour and a half of HD. A longer program fails or splits.
Mediasonic warns that a USB flash drive is not recommended, because recording is a continuous write and a flash drive’s sustained speed and write endurance are both poor for it.
So the other boxes need a hard drive, formatted correctly, and the listings mostly do not tell you which format.
Wi-Fi for firmware, which is the right call here
Dual-band Wi-Fi and Bluetooth support firmware updates and future NextGen TV enhancements.
On an ATSC 1.0 box this would be a convenience. On a 3.0 box it is close to necessary, because the standard is still developing — new features, new audio handling, new broadcaster behavior.
The two opposite approaches on this shelf make the point. ZJBOX states candidly: “This device is offline, and firmware updates are infrequent. If software updates are needed, please contact the seller.” Mediasonic publishes a version instead — “Latest Firmware Version: V1.7” — so at least you can check what you have.
A tuner built for a moving target needs a way to be updated.
The audio bullet carries a caveat worth querying
Dolby Digital Plus & AC-4 audio support… Smart TVs required for this functionality.
AC-4 is the codec ATSC 3.0 uses for sound, and it is how NextGen TV carries audio including dialogue-enhancement features.
Why a smart television would be required is not explained. The most plausible reading is that the box passes the bitstream through rather than decoding it, so the television or receiver at the other end must handle AC-4 — which today means a recent set. On that reading, an older HDMI television would receive stereo rather than the full format.
The listing does not confirm it. It is worth asking the seller before buying, because on a box bought specifically for NextGen TV, the audio is part of what you are paying for.
What a hundred and sixty dollars does not include
HDMI only. No composite, no component, no channel 3/4 RF — so this will not drive an old television. Which is coherent with the product (4K HDR has nowhere to go on an analog set), but it means the cheapest boxes here do something this cannot. allaboutadapters at $38.30 publishes four simultaneous outputs including component YPbPr and RF; iView’s 3500 models and Mediasonic have channel 3/4 for a set with only an antenna input.
No Clear QAM, which six cheaper boxes here have — so unencrypted cable channels on a coaxial feed are out, and so are the private QAM channels from building modulators that allaboutadapters names.
No antenna, stated — “TV antenna required”. Every box here needs one, and only the Tablo at $159.95 supplies it.
No warranty term, where ZJBOX publishes one year. No weight, no dimensions. No front display, where Mediasonic shows channel and sub-channel plus a standby clock.
Against the Tablo at four cents less
Two very different hundred-and-sixty-dollar answers:
ADTH, $159.99 — ATSC 3.0 + 1.0 · 64 GB built in · 4K HDR · HDMI output · Wi-Fi for updates · one tuner · antenna not included
Tablo, $159.95 — four ATSC 1.0 tuners · no video output — it streams over your network · antenna included (35-mile) · requires Wi-Fi and the internet · will not work with a non-smart TV or a PC
One tuner with a future, or four tuners with a household. Pick by whether your television has an HDMI socket you intend to use.
Prices quoted in this text were read on October 4, 2026. The live price is at the top of the page.
