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GL-iNet 5G Spitz AX (GL-X3000NR) External Antenna Guide


Looking to get the best possible data rates from your GL-iNet 5G Spitz AX (GL-X3000NR)?

You’ll want to purchase and connect external MIMO antennas to the device’s four SMA ports.

In this guide, we'll:

  • Recommend the best external antennas to use.
  • Show where the SMA ports are located.
  • Explain how to aim the antennas for best results.

In this guide

The Best External Antennas for the Spitz AX

Using a MIMO antenna outside your building, pointed at the nearest tower, can help you get the fastest LTE data rates possible.

The Spitz AX has four cellular SMA ports, two on the back and one on each side. These allow for a 4x4 MIMO antenna to be connected to the device.

Which of the two different 4x4 MIMO External Antenna Kit options to use depends primarily on how much time you're willing to spend on aiming.

The easiest antenna choice for the Spitz AX is our QuadMini Antenna Kit. With up to 5.2 dBi of omnidirectional gain and multiple mounting options, it is designed to be extremely simple to install outdoors or indoors, at home or in an RV.

Easy install, no aiming

Upgrade your 5G in minutes with no aiming, and four easy mounting options.

However, if you're willing to spend a little bit of time aiming, our QuadPro Antenna Kit will generally get you the fastest data speeds, thanks to its 9.1 dBi of directional gain. This is particularly important if you're on the edge of coverage, or have very weak signal.

Best performance, requires aiming

Aim QuadPro at your nearest tower for blazing data, even at the edges of cellular coverage.

Why External Antennas Are Critical for Improving Data Rates

Most people think that external antennas primarily help you increase your data rates by increasing the signal strength. But that's not the case.

An increase in signal strength is often less important than other ways that external antennas help.

Here are the three main ways that external antennas help you increase your data rates:

1.They Improve Signal Quality

In 4G LTE and 5G networks, signal quality is measured as SINR (Signal to Interference plus Noise Ratio) or sometimes as RSRQ (Reference Signal Received Quality).

Improving signal quality has a huge impact on your data rates.

Higher data rates allow your hotspot to communicate using "higher order modulation schemes." That means they can use the same wireless spectrum to send more data per second.

However, there's one big caveat:

In order to improve your signal quality, you need to both aim and shield your outdoor antenna properly. We talk more about this in the next section.

2.They Allow You To Connect On More Bands

Cellular Routers like the Spitz AX support an LTE feature called "carrier aggregation."

Carrier aggregation allows the Cradlepoint router to connect on multiple cellular bands simultaneously.

The more bands you're connected to, the greater the bandwidth, and the higher your data rates.

However, many of the higher frequency bands aren't able to penetrate into buildings. Using external antennas allows you to access higher frequency bands, which are often less congested and offer higher speeds than lower frequency bands.

3.MIMO Isolation

MIMO (Multiple Input Multiple Output) technology uses signals travelling along multiple paths simultaneously, increasing both bandwidth and reliability in wireless connections.

MIMO isolation is the antenna's ability to handle several data streams at once, cleanly and without interference, leading to quicker data speeds and steadier connections

Our external antennas are specifically designed for superior MIMO isolation, and dramatically outperform standard built-in antennas found in most home devices.

This means you'll see a more reliable connection with enhanced bandwidth, ensuring smoother streaming, gaming, and browsing with minimal interruptions.

Installing External Antennas to the Spitz AX

Before getting started, it's always a good idea to run a couple of speed tests indoors from a device connected to your Spitz AX's WiFi. The results will fluctuate a little, but this is the baseline you're trying to improve.

Once you've tested your baseline internet speeds, you're ready to install external antennas.

In the next section of this guide, we'll show you how to connect adapters for external antennas to your Spitz AX.

The Spitz AX has four cellular antenna ports, labeled MAIN, DIV/GNSS, MIMO 1, and MIMO 2. These the ports will be connecting to your MIMO external antenna.

The MAIN and DIV/GNSS ports are found on each side of the device, while the MIMO 1 and MIMO 2 ports are grouped together on the back.

Step-by-Step Guide to Installing Adapters for External Antennas

Step 1: Disconnect the standard paddle antennas that are connected to all of the cellular antenna ports.

Step 2: Connect the external MIMO antennas to the newly available cellular SMA ports on your Spitz AX in the order shown below:

device ports
antenna ports

Note: The cable paths of the UltraFlex-Quad Cables are labeled 1 through 4 on the cable jackets to assist with matching the cable connectors on each end of the cable.

Congrats! Your Spitz AX is now connected to your more powerful MIMO External Antennas.

Positioning and Aiming MIMO Antennas

Correctly positioning and aiming MIMO antennas is crucial to getting the best performance to your Spitz AX, or indeed any other router.

We've actually compiled a detailed QuadPro and QuadMini instruction manual to accompany our own MIMO Antenna Kits, where we go into depth on the best ways to aim the antennas.

The goal is to find the best location and direction for the antenna(s) to maximize data rates to the hotspot. It can take a little patience, but can have a huge impact – it’s worth a bit of extra effort!

Once you've got your external MIMO antennas connected, you're ready to go outside with your "test-rig".

With each location and direction you try, run a couple speed tests, and make a note of the results. Here are all the locations and directions where we recommend testing your MIMO antenna:

Where to test your signal

Where to test your signal

Pro tip: Don’t just go to the highest point of the roof! While signal is generally stronger the higher you go, there’s also often more interference. We’ve found it’s often better to mount the antenna(s) on the side of the building where the structure can shield the antennas from interference.

Once you've found the position which gets you the highest data rates to your Spitz AX, that's where you'll want to install the MIMO antenna. Go ahead and mount the antenna, run cables inside, connect everything up, and enjoy superior data rates!

GL-iNet 5G Spitz AX Technical Specifications

Supported 4G LTE bands

  • AT&T: B2, B4, B5, B12, B14, B17, B29, B30, B46, B66
  • Verizon: B2, B4, B5, B13, B46, B48, B66
  • T-Mobile: B2, B4, B5, B12, B25, B26, B41, B66, B71
  • Other: B1, B3, B7, B8, B18, B19, B20, B28, B32, B34, B38, B39, B40, B42, B43

Supported 5G NR bands

  • AT&T: n5, n77
  • Verizon: n2, n5, n40, n66, n77
  • T-Mobile: n41, n71
  • Other: n1, n3, n7, n8, n12, n13, n14, n18, n20, n25, n26, n28, n29, n30, n38, n48, n70, n75, n76, n78, n79

Cellular Module

  • Module: x62 Qualcomm Quectel RM520N-GL

  • CPU: MediaTek Dual-core MT7981A, @1.3GHz

  • Memory/Storage: 512 MB DDR4, 8 GB eMMC

  • MIMO Support: 4x4 MIMO DL, 2x2 MIMO UL

  • LTE-A Carrier Aggregation: 5x Download, 2x Upload

  • LTE Performance Category: Cat 19

  • Max Theoretical Speeds:

    • 5G SA: 2.4 Gbps (DL), 900 Mbps (UL)
    • 5G NSA: 3.4 Gbps (DL), 550 Mbps (UL)
    • LTE: 1.6 Gbps (DL), 200 Mbps (UL)


  • Wi-fi Version: Wifi 6
  • Wifi Standards: 802.11ax
  • Bands: Simultaneous Dual-Band (2.4 GHz / 5 GHz)
  • Max Theoretical Speeds: 574 Mbps (2.4 GHz), 2402 Mbps (5 GHz)


  • Cellular Antenna Ports: 4x SMA-Female
  • Wi-Fi Antenna Ports: 2x RPSMA-Female
  • Ethernet (RJ-45) Ports: 1x 2.5 Gbps WAN , 1x 1.0 Gbps LAN
  • SIM Ports: 2x Nano SIM slots
  • Other: 1x USB-A 2.0

The specifications shown above are specific to the 5G Spitz AX (GL-X3000NR), and do not encompass the specifications of the 4G LTE Spitz AX (GL-X3000C16).

Other Helpful Resources

GL-iNet Spitz AX (GL-X3000) Resources

GL-iNet Spitz AX (GL-X3000) Product Overview

GL-iNet Spitz AX (GL-X3000) Unboxing and Setup Guide