What the maker puts in writing
- “Our ATSC digital TV converter box receives over-the-air ATSC digital TV broadcast via external antenna and converts it to your Analog and Digital TV, Projector, and Computer Monitor. TV recording, Favorite Channel List, Parental Control Function”
- “The 1080p output resolution allows you to watch and record free to air television depending on signal quality. Closed Caption, Auto Tuning, Timing Start Up & Shut Down”
- “Note: This device does not have built-in storage and requires an external storage device. It is best suited for external hard drives with a FAT32 file system capacity of up to 4TB or flash drives with a capacity of up to 32GB”
- “What You Get: 1 x Digital TV Box, 1 x Remote Control, 1 HDMI Cable, 1 Composite cable, 1 year Warranty”
- “Note: …requires an external antenna to receive signals. It does not have signal reception or amplification functions and cannot replace other types of audio-visual equipment (e.g., cable TV set-top boxes). This device is offline, and firmware updates are infrequent”
Naming the filesystem is the single most useful thing on this shelf
Best suited for external hard drives with a FAT32 file system capacity of up to 4TB.
FAT32 cannot hold a file larger than 4 gigabytes.
At typical over-the-air high-definition bitrates — roughly 8 to 12 megabits per second — that is somewhere between forty-five minutes and an hour and a half per file. A longer program either stops at the limit or is split into parts, depending on the firmware.
And there is a second wrinkle: Windows will not format a drive above 32 GB as FAT32 using its own tools, so a 4 TB drive needs third-party software.
Four other boxes on this shelf claim “up to 4TB” and name no filesystem. Whether they share the constraint is unknown — and it is the constraint that actually decides whether you can record a film.
Mediasonic adds the complementary warning nobody else gives: use an external hard drive, because “USB flash drive is not recommended”. Recording writes continuously, which is exactly what a flash drive handles worst. This listing offers the flash drive option at 32 GB; take Mediasonic’s advice over it.
And it is honest about three other things
No built-in storage. This device does not have built-in storage and requires an external storage device. Stated plainly, where seven listings leave it implied. Only the ADTH at $159.99 has storage of its own — 64 GB.
No antenna, and no amplifier. Requires an external antenna… It does not have signal reception or amplification functions. This is the commonest misunderstanding about converter boxes: without an antenna on the coaxial input the box finds nothing, and a weak signal stays weak. Every box on this shelf needs an antenna and only the Tablo supplies one.
Not a cable box. Cannot replace other types of audio-visual equipment (e.g., cable TV set-top boxes). Mediasonic says the same thing with names: “does NOT work with TIVO, and Other Cable Company like Comcast, DirectTV, DISH Network, and Time Warner Cable.”
The offline note, read both ways
This device is offline, and firmware updates are infrequent. If software updates are needed, please contact the seller via Amazon.
The cost: a bug that appears — a channel scan missing stations, a recording that fails, a crash on certain streams — has no automatic fix coming.
The benefit, which the listing does not claim: a box with no network connection cannot phone home, cannot be remotely altered, and cannot be bricked by a bad update.
The two other approaches here are worth setting beside it. Mediasonic publishes an actual version — “Latest Firmware Version: V1.7” — so you can check what you have. The ADTH has “dual-band Wi-Fi and Bluetooth [to] support firmware updates”, which is the correct design for an ATSC 3.0 box since that standard is still developing.
Cables and a warranty, both rare here
1 x Digital TV Box, 1 x Remote Control, 1 HDMI Cable, 1 Composite cable, 1 year Warranty.
The only warranty term published on this shelf. Nine other listings mention none.
And two cables, so it connects to a modern television or an old one out of the box. Mediasonic supplies a 5 ft HDMI cable; Zenith supplies an RF cable and AV cables; the other seven itemize nothing.
And the practical features are all there
Recording, a favorite channel list, parental control, closed captioning, auto tuning, and timed start-up and shutdown.
The favorite channel list is the one worth noting: an over-the-air scan in a city can find sixty or seventy sub-channels, most of them shopping and religious broadcasters, and stepping through all of them to reach channel 7.1 gets old quickly.
Media playback from USB covers photos, MP3 and video.
What is not published
No ATSC version. “ATSC” without a number means ATSC 1.0, the standard since 1998 — and ATSC 3.0 (“NextGen TV”) is replacing it station by station, so a 1.0 box loses channels as broadcasters move. Only the ADTH handles both; only Mediasonic warns it does not.
No Clear QAM, which six of the ten boxes here have — so unencrypted cable channels on a coaxial feed are out.
No front display, where Mediasonic shows channel and sub-channel plus a standby clock and allaboutadapters has a large LED panel. Without one you must turn the television on to see where the box is.
No weight and no dimensions.
Prices quoted in this text were read on October 4, 2026. The live price is at the top of the page.
