According to an investigation by Canada's Privacy Commission, the hackers likely used a long-range antenna to tap the stores' wi-fi networks.

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The ultra-compact ATSC-Mobile tuner receives mobile TV signals from a miniature antenna for use on-the-go, or a rod antenna, which provides broader range at home or in the office.

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It contains a device that measures such things as temperature, motion and light intensity, and it sports a miniature antenna and a radio with a range of 10 to 50 meters.

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