Only purchase this item if you will not face serious situations where RF devices are detected. Be prepared to pay around $500 for a real deal that will be positioned exactly how you want it. You must have a device that will tell you the exact frequency you are following and be able to filter out other signals that you do not need. You also need to have an idea of the frequency of the radiation from the device you are looking for. The right equipment for this type of work is not usually sold as spy gear.
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