|First we need to know what you wish to receive. Do you want to watch TV shows that are delivered to your home on some cable system or simply OTA broadcast. Also what band?|
A tuner card and usb are basically the same. Both have less quality reception to a standard tv in terms of signal. Usb may be a bit less quality than internal. External exist too. Silicondust makes a network type that is pretty good.
A very week system may not do well on a usb. HD tv shows can get quite big. Like 7G per show.
Text, talk, drive...CRASH.
Hang up and drive @#$%^^