A walkie talkie tuned in on our favourite number, maybe, so we can keep each other around us updated. Keep it in a Faraday Box methinks with something to manually charge it.
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Good idea for comms with neighbors. Look up and research "Sound Powered Telephones" and also "Ground-Return Telephony" where only one wire is needed, the Earth providing the other path. Used in WW1 and WW2.