This product is no longer available and has been replaced by: 38485.
31128 8 dBd Yagi Wideband Antenna with Mounting Hardware
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Free Support Yes


The 31128 is a wideband Yagi directional antenna. It is uniquely suited for cellular applications because of its ability to provide gain across all of the cellular frequency bands. The antenna has a Type N Female connector and includes the mounting hardware.

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Detailed Description

The 31128 is a high-gain, directional, Yagi antenna. Its narrow beam width requires precise aiming. This antenna is for fixed installations. It is not intended for mobile applications. For more information, refer to this full-color gain plot


Antenna Type Yagi, directional, dc grounded
  • 5.8 dBd (700 to 800 MHz)
  • 5.8 dBd (824 to 894 MHz)
  • 4.8 dBd (880 to 960 MHz)
  • 6.8 dBd (1710 to 1880 MHz)
  • 8.3 dBd (1850 to 1990 MHz)
  • 7.8 dBd (1990 to 2700 MHz)
Average SWR
  • 1.6:1 (700 to 800 MHz)
  • 1.4:1 (824 to 894 MHz)
  • 1.3:1 (880 to 960 MHz)
  • 1.2:1 (1710 to 1880 MHz)
  • 1.2:1 (1850 to 1990 MHz)
  • 1.2:1 (1990 to 2700 MHz)
Impedance 50 ohm
Horizontal Beam Width 70° to 90°
Vertical Beam Width 85° to 110°
Front/Back Ratio > 20 dB
Maximum Power 100 W
Polarization Vertical
Connector Type N female
Temperature -40° to +158°F
Wind Surface Area < 465 cm2 (0.5 ft2)
Mounting 3.18 to 5.08 cm (1.25 to 2 in.) OD pipe
Dimensions 29.01 x 21.01 x 6.50 cm (11.42 x 8.27 x 2.56 in.)
Weight 1.50 kg (3.31 lb)


Note: The following shows notable compatibility information. It is not a comprehensive list of all compatible or incompatible products.

Data Loggers

Product Compatible Note
CR300 Compatible with the -WIFI, -RF407, -RF412, -RF422, -RF427, and -CELL2XX options.
CR310 Compatible with the -WIFI, -RF407, -RF412, -RF422, -RF427, and -CELL2XX options.
CR6 Compatible with the -WIFI, -RF407, -RF412, -RF422, -RF427, and -RF451 options.
CRVW3 Compatible with the -RF451, -RF407, -RF412, and -RF422 options.
CRVW3-NE Compatible with the -RF451, -RF407, -RF412, -RF422, and -RF427 options.

Communication Devices

Product Compatible Note
NL240 (retired)
RF401 (retired)
RF451 (retired)

Additional Compatibility Information

This antenna is compatible with all of our radios that operate between 700 and 2700 MHz. However, the 31128 is uniquely suited for use with cellular modems. This antenna can be used with any of our cellular product offerings. A coaxial cable is required to attach the 31128 to the radio. This antenna typically attaches to a cellular modem via the 21847 12 ft cable or the COAXSMA-L. If surge protection is required, the 31128 connects via the COAXNTN-L and 31317 surge protection kit.


The antenna includes a mount/U-bolt assembly that allows the antenna to be secured to a mast, crossarm, or user-supplied pole with an outer diameter of 3.18 to 5.08 cm (1.25 to 2 in.). The antenna should be mounted with 3 feet of clearance in all directions around it. The 31128 should be positioned so that it has the most unobstructed line of sight to the cellular service provider’s strongest signal, and it should be mounted so that the weep holes are pointing down.


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