The very narrow bandwidth of small, highly resonant antennas can be used to create a tuning circuit for a radio receiver. Here's how it was done in the early days of radio.
Antennas as Part of a Receiver
Tag: Chu Limit
The Chu Limit
The Chu-Herrington theorem states that for an antenna of a given size there is a minimum limit to the Quality Factor (Q). This limit is called the Chu Limit.
ARSI 
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