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It would depend on the types of tags you are using. If you wanted to read tags from a distance of 10 feet or more, you would need to use passive UHF RFID transponders, and it would be difficult to read those consistently if the tags were stacked one on top of another or back to back. The metallic antenna of one tag would likely block the energy from reaching the tag below it.
However, Magellan Technology developed a technique called phased jitter modulation, enabling HF tags to be read even if they were stacked one on top of another. These tags can be read from a distance of 1 or 2 feet. If that is all the read distance you require, I would suggest you contact SATO Global Solutions, which acquired Magellan in 2013.
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