Cel-Fi GO G31 Optus Mobile Phone Repeater Kit + RFI CDQ8197 7.5dBi Black Antenna

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This product is over AusPost size limit and will be sent via another carrier to a physical address only
Quick Overview

Cel-Fi GO G31 mobile phone repeater for the Optus network within Australia.

The Celfi G31 GO is a fully authorised and legal mobile phone repeater that boosts the signal to mobile phones on the Optus network.

This listing is for the Cel-Fi GO G31 repeater on the Optus network and comes with a 12 volt power cable that plugs into a cigarette lighter port which can be cut down and hard wired into a vehicle, plus an internal patch antenna with 4m cable, plus an external RFI Heavy duty 4.5dBi to 7.5dBi black antenna with removable whip measuring 1210mm in length and 5m coaxial cable fitted with an SMA plug to connect directly to the Cel-Fi.


On all in-stock items

Our standard Cel-Fi Mobile/Vehicle Booster kits all come with the following 3 components:

  • A Cel-Fi GO G31 repeater which is ordered as a Telstra or Optus version, or the Cel-Fi G32 repeater which is selectable within the WAVE app for either Optus or Vodafone.
  • A 12V/24V DC power cable with Cigarette Lighter Adaptor (CLA). The cigarette lighter adaptor can be cut off so the unit can be hard wired.
  • An RFI Patch server antenna which is a small rectangular stick on antenna.

Mobile Antenna Selection

You need to select the external donor antenna that will suit your requirements and there are 3 important factors to consider when selecting the CORRECT antenna which are in order of importance:

  1. Gain
  2. Strength and Durability
  3. Removeable Whip


Donor Antenna Gain Options
GainSuitable for

Around and close-ish to town or where the cellular towers are located in built up or hilly areas. Perfect for in the bush not that far out of town where signal is scratchy.

Shorter distance but much better in hilly/bushy terrain.


This is an all round antenna suitable for further out of town but slightly flatter terrain.

This is the antenna gain that we (Tin Can Solutions Owners) use and recommend which we have been able to achieve an extra 50km useable Telstra service compared to another phone on Telstra not connected to the Cel-Fi. We have been able to run our business remotely by taking phone calls and process orders in places that we normally would't be able to without this setup.

This antenna is a good all-rounder for marine/boating applications.


Suitable for flat/undulating terrain where longer distances are required but there's no mountains around blocking the signal.

Perfect for people who live and work in these locations or for people who are going to do a fair bit of travel in these areas.

This antenna is a good choice for marine/boating applications requiring that bit further distance.


Suitable for VERY flat/undulating terrain where much longer distances are required and there's definitely no mountains around blocking the signal.

An option for people who live and work in really flat locations or for people who are going to travel in these areas.

For people who don't live and work in these areas, we recommend setting up the system with a 6.5dBi antenna and then having a spare 8.5dBi whip to swap over when travelling into really flat terrain.

This antenna is a great choice for marine/boating applications for when a long way out at sea, but in flat seas only because when the boat rocks from side to side, the signal beamwidth being broadcast from the antenna is very flat and will also rock up and down sending the signal into the sky and the water which will cause drop-outs.

The collinear donor antennas that we supply for mobile/moving applications come in 3 versions.

  • Fixed Whip on Standard Duty Spring - RFI CD Series Antennas - Perfect for highway use and mild dirt roads, comes with a standard duty spring base. These are a fixed whip antenna and cannot be removed from the base.
  • Removable Whip on Medium Duty Spring - RFI CDR Series Antennas - Better suited to highway use with dirt roads thrown in and come with a medium duty spring base and removeable whip which unscrews off the base to store when not in use.
  • Heavy Duty Mothership - RFI CDQ Series Antennas - Perfect for severely corrugated dirt roads, 4WDing/Off-roading and commercial/industrial use. These are really tough antennas which look the part and come with a heavy duty spring base and a RFI Quickfit® removeable whip which unscrews off the base to store when not in use.

We also stock the RFI CSM600 magnetic base antenna for applications where you want to take the unit between vehicles or structures. The magnetic base cellular LTE antenna is only recommended for highway/sealed roads use where the signal is scratchy such as 1 bar of service that you need to get that little bit of extra service but don't want to mount an antenna to your vehicle. The antenna gain is 2.5dBi to 4dBi so it is suited to shorter distances where service intermittently breaks up between mobile phone towers. This solution will improve the mobile phone service when there is a sniff of service outside.

So which Antenna do you get?

There is a highly informative and totally independent review/article on testing of some well known brands of Cel-Fi Go compatible antennas and which ones performed the best. This link is to an external website called "CHOICE" and we have absolutely no affilliation with the author or the website. click here for the article which we think is a worthy read.

This article clearly shows that the RFI antennas outperform other brands by over 10km and this is the exact reason why we believe in RFI Antennas to which we are an Authorised RFI Dealer in Capalaba Brisbane and a Capalaba QLD stockist of RFI antennas.

We believe RFI antennas are simply the best available on the market.

Ease of installation:

Our CelFi kits are all plug and play which means you can just plug it all together without the need to order more parts and adaptors to join things together.

Read more in our Articles:

To read more on the Cel-Fi Go and how to set it up correctly, read our Cel-Fi Mobile Setup Guide here.

How do the Cel-Fi work?

In short, the Cel-Fi Go G31 is a mobile phone / cell phone repeater that pulls in a weak signal from cell towers in the area through the donor antenna which is normally mounted outside the vehicle as high as possible, and boosts the mobile phone signal into the vehicle through the server antenna. Any phones on the same provider within range of the server antenna will communicate via this antenna thinking it is just another cell tower and the Cel-Fi will boost the phones signal back to the cell towers. 

The donor and server antennas are an extremely important factor to the whole system and can make or break how successful the Cel-Fi is in boosting a signal. An inferior antenna will not receive weak signals as well as a proven brand of antenna and we continually get calls from customers that have purchased another branded antenna elsewhere and they say their system doesn't work well. We explain further on some factors around the antennas which should help you to choose a setup that is right for you.

The Cel-Fi Go is setup with your phone, tablet or smart device via an app called the Nextivity WAVE app through a Bluetooth® connection. This app can also be used to monitor the status of the Cel-Fi and to change settings such as 3G, 4G or Auto modes and Mobile or Stationary modes.

There is another app called the Nextivity MyWave app which is used to tell the Cel-Fi to boost the same band that the phone is on which helps to reduces drop-outs. More on these below.

General Info About Cel Fi Go G31 and G32

Designed to solve cellular coverage issues for indoor, outdoor & moving/mobile applications, the Cel-Fi GO G31/G32 Smart Signal Repeater is the first carrier-class cellular coverage solution to offer industry-leading signal gain. Through artificial intelligence and Nextivity’s award-winning Intelliboost signal processing, GO G31/G32 delivers the industry’s best voice and data wireless performance. The system is also guaranteed to be unconditionally network safe and does not interfere with other wireless devices. The Celfi GO G31/G32 is NEMA 4 rated (hose proof for short intervals) to provide reliable coverage in any harsh setting.

Multifaceted Uses
Can be used in Homes, Offices, Warehouses, Outdoor Areas, Commercial Spaces, Agricultural Settings, Manufacturing Spaces, Vehicles, Boats, Trucks and many more places that a phone signal needs to be boosted and improved.

Multi User
Many users can automatically connect to the Cel-Fi Go just like they do to a mobile phone tower.

Maximum Gain
Industry Leading 3G/4G/4GX Voice and Data up to 100dB depending on the region.

Best Performance
Smart Signal Repeater with IntelliBoost® Chipset Smart Technology.

Ease of Setup
Easy Setup for DIY Installers and Maximized by AntennaBoost® technology.

Download Nextivity Cel-Fi WAVE and MyWAVE Apps

Mobile App for Registration, System Set up and Changing Modes.

Get it on Google Play Download on the Apple App Store

or scan the QR code below with your devices QR scanner

Nextivity Wave QR Code

Mobile App to enable your Cel-Fi Go to automatically track the same cellular base station/tower as your phone which reduces drop-outs when travelling between towers.

Get it on Google Play Download on the Apple App Store

or scan the QR code below with your devices QR scanner

Nextivity Wave QR Code

Carrier Specific
The CelFi Go G31 and G32 are carrier specific.

The G31 needs to be ordered for either Telstra or Optus.

The G32 is for Optus and Vodafone, but needs to be setup via the WAVE app to either Optus or Vodafone, not both. 

The Cel-Fi G31 and G32 do not boost multiple carriers at the same time.

Weather Resistant
IP54 Rated for Indoor or Outdoor Installations.

Network Safe
Carrier Approved with No Noise Interference Guarantee.

Mode Switching
Switch between Mobile and Stationary through the Cel-Fi WAVE app. Simply connect to your repeater with Bluetooth® and select the Mobile or Stationary Mode from the Settings page which means you can have a system at home or work and take it with you when you travel.

More Information
Bundled BrandRF Industries (RFI)
Cellular CarrierOptus
Radio BandLTE
Input Voltage9.6 to 28.8 VDC
RF GainUp to 100dB Gain
Antenna Gain7.5 dBi
Cel-Fi GO G31 Brief
Cel-Fi GO G31 Datasheet
Cel-Fi GO G31 Mobile Quick Start Guide


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If you've got any queries, call us on +61 7 3180 3840, or flick us a message below.