I use the Hauppauge Nova TD USB tuner and it works a treat. The twin tuner system works well with both aerials being used in poor signal areas. My daughter has the single tuner version for her laptop at university - with good speakers her laptop is a complete entertainment system - ideal for the limited space in a hall of residence room. She has used it with the One For All SV9360 Amplified aerial which improved the performance on the weaker channels.
The twin tuner version includes a remote control whereas the single tuner one does not so the bit extra for the twin tuner is well worth it.
Good luck