Need Help! Unique detection task.

[ericEE]

I'm looking for some expertise in building a simple detector circuit and coil for a unique detecting task. I would like to keep the information private (for now) since this task is part of a competition. Mainly I need to figure out which type of coil to proceed with and size as well as a home built circuit and operating frequencies. I can provide more details one-on-one. Any help would be greatly appreciated.

 

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