You can use SichboPVR's device telemetry to find reasonably well behaving/known working TV tuner products, or perhaps figure out whether you've already bought a piece of shit by seeing if a bunch of other folks can't get their tuner to bring in channels either.
Unfortunately we don't have product names as they appear on the packaging, but hopefully you can use your intellectual super powers to decipher which TV tuner "driver" name corresponds with products available from your favourite gear slinger.
Browse device telemetry by type:
DVB-T/T2 - Over the Air (most of the world except North America)
ATSC - Over the Air (North America)
DVB-S/S2 - Satellite
DVB-C/C2 - Cable