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An FM Broadcast-band antenna and 802.11b antenna are vastly different - the wavelength of a tuned 802.11b antenna is about 1/24 that of the FM BCB (100MHz) - and typically the 802.11b antennas are constructed to have much more gain than a simple 1/4-wave antenna like the FM antenna is. Most antennas, especially those the transmit as well as receive, are tuned over a narrow frequency range - typically only a few percent of the carrier frequency.
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