I had the misfortune of purchasing two of these PCIe TV tuners (as per lsusb):
Bus 004 Device 002: ID 1f4d:a803 G-Tek Electronics Group Bus 003 Device 002: ID 1f4d:a803 G-Tek Electronics Group
I’d assumed that the RTL2832U was a common chipset, and would detect on a stock kernel. How wrong I was. Not only do you need to compile media_build, you need to patch media_build for this card to detect.