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You could use an active RFID system for this application. An active ultra-wideband (UWB) system would give you very precise location data, but it would require several receivers. Active tags cost $25 or more apiece, but since you only need a few, this shouldn’t pose an issue. You could also use a passive overhead real-time location system. You might be able to cover the entire stage with a single reader if the ceiling were high enough. I would suggest you contact RF Controls, which should be able to provide what you’d need.
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