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Antenna gain vrs. Bandwidth.



I've noticed a relationship between bandwidth and antenna gain. My observations are based on antenna descriptions by the mfg/seller of the antennas.

Example, an antenna described as a vhf 5/8 wave antenna will claim a 3 dbd gain. With a 6 MHz bandwidth. A 1/4 wave antenna unity gain ( same mfg) will be described as not needing a tune over 30+ MHz.


My question is: Does this relationship actually exist?

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