This product is no longer available and has been replaced by: 32256.
21831 800 MHz 0 dBd 1/2 Wave Whip Dipole Cellular Antenna
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The 21831 is a half-wave dipole whip antenna designed to attach directly to the SMA connector of a cellular modem operating at a frequency of 850 MHz. An antenna cable is not required. The 21831 is a lower-gain, omnidirectional antenna that transmits short distances.

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Detailed Description

The 21831 attaches directly to a cellular modem with SMA antenna connector. An antenna cable is not required. This unity gain omnidirectional antenna should reside inside a building or enclosure.


Connector SMA pin (male), plug
Frequency Band 824 to 896 MHz
Gain < 0 dBD (1.8 dBi)
Antenna Type 1/2 wave dipole, indoor
Radiation Pattern Omnidirectional
Polarization Vertical
Impedance 50 ohm
VSWR < 2.0:1
Material Black polyurethene with polycarbonate swivel and black chrome-plated brass connector
Operating Temperature -20° to +65°C
Storage Temperature -30° to +75°C
Diameter 1.25 cm (0.49 in.)
Length 22.4 cm (8.8 in.)
Weight < 5 g (< 0.01 lb)


The 21831 is compatible with any radio that has an SMA jack connector that operates between 824 and 896 MHz. Specifically, it is compatible with the RavenXT-series and LS300 cellular modems with SMA connectors. It is not compatible with the TNC antenna connections of the Raven100-series and Redwing100-series modems.

Frequently Asked Questions

Number of FAQs related to 21831: 1

  1. Unless otherwise designated as a powered or amplified antenna, antennas are passive devices that do not require external power for operation.

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