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# GNSS Antenna

The [u-blox GNSS Multiband Antenna](https://www.stereolabs.com/store/products/u-blox-gnss-multiband-antenna) (u-blox ANN-MB-00) is an active multiband antenna for the optional GNSS module of the [ZED Box](/docs/products/embedded/zed-box-series/zed-box/). Its multiband reception supports RTK, for centimeter-level positioning with the ZED SDK [Global Localization](/docs/development/zed-sdk/modules/global-localization) module.

![u-blox GNSS multiband antenna](/_fern-files/_img/6ad2a323a7144986a6cf5ca671e88cfeefc1f2129830faced1ac6c68e22fdac0.webp)

## Specifications

| Feature            | Value                         |
| :----------------- | :---------------------------- |
| Model              | u-blox ANN-MB-00              |
| Type               | Active multiband GNSS antenna |
| Frequency bands    | L1 and L2/E5b/B2I             |
| Constellations     | GPS, GLONASS, Galileo, BeiDou |
| Ingress protection | IP67                          |
| Cable              | 5 m RG174 coaxial cable       |
| Connector          | SMA                           |
| Dimensions         | 60.0 x 82.0 x 22.5 mm         |

## Compatibility

| Device                                                                                  | Antenna                                                                                                                                                  |
| :-------------------------------------------------------------------------------------- | :------------------------------------------------------------------------------------------------------------------------------------------------------- |
| [ZED Box](/docs/products/embedded/zed-box-series/zed-box/) with GNSS module             | Connect the antenna to **port 5**, on the side of the ZED Box. See [Using GNSS with ZED Box](/docs/products/embedded/zed-box-series/zed-box/using-gnss). |
| [ZED Box 2 Max](/docs/products/embedded/zed-box-series/zed-box-2-max/) with GNSS option | Not needed: two multiband GNSS antennas are included with the device.                                                                                    |

> **Warning**
>
> The Wi-Fi antennas of the ZED Box do not work as GNSS antennas.

The GNSS module needs the antenna to have a clear view of the sky to get a fix. The [GNSS Overview](/docs/development/zed-sdk/modules/global-localization/gnss) explains how to mount the antenna on your vehicle or robot.