Enfora Observer IV - Manual (Page 21)

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Cellular antennas provided with the Observer.
Quad band operation utilizes two different antennas, shown above. The larger whip, on
the left, is tuned for 850/1900 MHz operation. The smaller ¼ wave radiator, on the right,
is optimized for 900/1800 MHz operation. In areas where sufficient signal strength is
present either antenna should function satisfactorily.