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The hardware in the PVR-250 and USB2 is fairly similar. The reason you receive better over the air reception on the USB2 is because the tuner/antennae is farther away from all the interference generated by the electrical components (CPU, hard drive...) inside your computer. You can test this out yourself with a portable radio. You will notice that you get all sorts of static as you move your radio closer to the computer. CRT monitors are another big source of interference.
You may be able to get even better reception if you buy a longer USB extension cable and move the USB2 farther away from other electrical devices.
People using cable usually aren't affected as much since they have a stronger signal and the cable is better shielded.
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