Milesight Active GPS Antenna – RA03

Milesight RA03 GPS Antenna

The Milesight RA03 is an external GPS antenna for Milesight industrial cellular routers that carry a GNSS receiver. It connects to the dedicated SMA GNSS port on the router and places the receiving element outside the enclosure, on a bracket, a vehicle roof line, or a wall. GNSS positioning depends on a clear line of sight to satellites, and a router sitting inside a metal cabinet or under a dashboard cannot get one. The RA03 solves that by moving the antenna to open sky while the router stays protected. It is compatible with the UF31, UR32, UR35, UR41 and UR75.

Key features

• Router compatibility: Works with the GNSS port on the Milesight UF31, UR32, UR35, UR41 and UR75.
• External sky view: Moves the receiving element outside the router enclosure, away from metal cabinets and vehicle bodywork.
• SMA GNSS connection: Connects to the dedicated 50 ohm SMA GNSS port on compatible routers. The router-side port carries a center pin SMA female.
• Multi-constellation reception: Feeds the router receiver, which tracks GPS, GLONASS, BeiDou, Galileo and QZSS.
• Standard position output: Once the antenna has a fix, the router makes position data available over NMEA0183 and PMTK.
• Matched accessory: Supplied by Milesight as the GNSS antenna for its cellular router range, so there is no guesswork over connector fit.

What the RA03 is used for

Vehicle and fleet tracking

Routers mounted in vans, plant, and service vehicles report location alongside connectivity status. The router itself sits inside the cab or a body panel where it cannot see satellites. The RA03 places the antenna on the roof line or windscreen area for a stable fix while the vehicle is moving. Position then streams to the back office over the cellular link.

Roadside and traffic deployments

ANPR cameras, variable message signs, and roadside sensor cabinets often tag their data with a location. A UR75 or UF31 in the cabinet handles the 5G or 4G uplink, and the RA03 gives the GNSS receiver the open-sky placement it needs. This keeps the position reference accurate without opening the cabinet to the weather.

Remote and mobile asset positioning

Temporary site connectivity, mobile generators, welfare units, and hired plant benefit from knowing where each asset is. Pairing a Milesight router’s GNSS receiver with the RA03 adds a position reference to the same device that already provides the network connection, which avoids a second tracking unit.

Cabinet and enclosure installations

A router inside a metal DIN-rail cabinet is effectively blind to GNSS. Rather than move the whole router, the RA03 runs from the router’s SMA GNSS port to an external mounting point with a clear view of the sky. The router stays inside the protected enclosure and still returns a reliable fix.

Installation notes

GNSS accuracy is driven far more by antenna placement than by anything set in software. Mount the RA03 with an unobstructed view of the sky and away from large metal surfaces that block or reflect satellite signals. On the UR32 and UR35, GNSS is a factory hardware option and shares its module slot with Wi-Fi, so the router must have been ordered with the GNSS module for the RA03 to work. GNSS is standard or available on the UR41, UR75 and UF31. If you are unsure whether your router carries a GNSS receiver, check the order code before ordering the antenna, or call us and we will confirm it.

Frequently asked questions

Which Milesight routers does the RA03 work with?

Milesight lists the RA03 as compatible with the UF31, UR32, UR35, UR41 and UR75. On the UR32 and UR35, GNSS is a factory-fitted option, so the router needs to have been supplied with the GNSS module. On the UR41, UR75 and UF31, GNSS is standard or available as part of the specification.

Do I still need an antenna if my router already has GNSS?

Yes. The router provides the GNSS receiver, not the antenna. The receiver still needs an external antenna with a clear view of the sky to acquire and hold a fix. The RA03 is that antenna. Without it, a router inside a cabinet or vehicle will struggle to position at all.

Can I use GPS and Wi-Fi at the same time on the UR32 or UR35?

No. On the UR32 and UR35, Wi-Fi and GPS are mutually exclusive hardware options that share the same module slot and are set at the factory. A unit ordered with Wi-Fi does not have the GNSS module, and a unit ordered with GNSS does not have Wi-Fi. Confirm which option your router carries before ordering the RA03.

Is the RA03 an active or passive antenna?

Milesight supplies the RA03 as the GNSS antenna for routers whose GNSS ports are built to power an active antenna. Confirm the active or passive rating and the gain figure from the product packaging or a Milesight distributor spec sheet before relying on them for a specific installation. See the specification table below for the fields still to be verified.

What connector and cable does it use?

The RA03 mates with the router’s 50 ohm SMA GNSS port. The exact antenna-side connector gender, cable length, and mount type are not published on Milesight’s public accessories listing. Call us and we will confirm the current specification against stock before you order.

Related products and further reading

The RA03 pairs with Milesight routers that carry GNSS, including the Milesight UR41 4G Cat 4 router with GPS and the Milesight UF51 5G outdoor CPE. Browse the full range on the Milesight industrial routers and Milesight 5G routers pages. To understand how positioning works on cellular routers, read our guide to GNSS and GPS on cellular routers. For fleet and mobile deployments, Milesight DeviceHub can plot a GPS-enabled router’s location on a map and record its route.