Are you interrested in RFID? Or maybe you’re already using RFID in your projects? Sometimes cards and key rings are to big, then, you might be interested in glass RFID capsule: https://nettigo.eu/products/token-rfid-125-khz-glass-capsule
If the capsules are too small, you might want to try this: https://nettigo.eu/products/complete-rfid-set
And here’s video showing multiple antennas with one receiver:
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