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It works good without a shield as long as there is some distance away from the unwanted currents. They fall off REALLY fast. Something 1 inch away has almost no effect when compared to 0.0625" away. And currents that are perpendicular to the current you are measuring don't have an effect either. I remember, with a 0.125" thick daughter PCB right on the bus bar, the current sensor range was about -1200amp to 1200amp. A 0.0625" PCB gave a range of maybe -300amp to 300amp or something like that. At 0.5" away, you could probably measure -10,000amp to 10,000amp. So, if there is a spurious current 1 inch away, even if it's a few hundred amps, it's not going to have much effect.
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