That's a very interesting product idea, It's a television tuner that is OS-independent..
So the answer to your original question appears to be:
Yes, you can use it with FreeBSD.
That topic links to a thread containing a open source remote configuration program.. no drivers are required because it's connected via your local network.
The features are impressive, you can record and stream shows using VLC Media Player.. and probably other applications.
There is a tutorial explaining how to use it with VLC:
http://www.silicondust.com/forum/viewtopic.php?t=1924