Oh wow, why so many tuners? Are you really going to record 8 different programs at once? (and could a pc handle that much..?)
And Knight, it depends on your location as to how many antennas you need or what setup you need.
I'm in the GTA in such a position that I can point an antenna south at Buffalo and still pickup Toronto stations from the side in good quality.
If stations are in two opposite directions, you'd need two antennas, or a rotor, or perhaps more complex setups depending on your needs.