--- title: Underground Communications description: RFI are experts in underground communications solutions --- - [Contact](https://www.rfi.com.au/contact) - [Call](tel:1300000734) - [Find a dealer](https://www.rfi.com.au/stores) - [Quick Order](https://www.rfi.com.au/cart?openQuickOrder=true) - [TRACK ORDER](https://www.smartfreight.com/tracking) - [Login](https://www.rfi.com.au/sca-dev-2020-1/checkout.ssp?is=login&login=T&fragment=login-register&_ga=2.72028371.1913000088.1622433919-1321836579.1622433919) - [CART](https://www.rfi.com.au/cart) [![RFI](https://products.rfi.com.au/hubfs/raw_assets/public/RFI_May2021/images/rfi%20logo.svg "RFI")](https://www.rfi.com.au/) - [Services](https://products.rfi.com.au/en-au/service-division) - [Communications Products](https://products.rfi.com.au/communications) - [Antennas](https://www.rfi.com.au/comms-products/antennas) - [Cellular](https://www.rfi.com.au/comms-products/antennas/cellular) - [PMR/LMR](https://www.rfi.com.au/comms-products/antennas/pmr-lmr) - [WI-FI](https://www.rfi.com.au/comms-products/antennas/wifi) - [GPS](https://www.rfi.com.au/comms-products/antennas/gps) - [ISM](https://www.rfi.com.au/comms-products/antennas/ism) - [CB](https://www.rfi.com.au/comms-products/antennas/cb) - [Marine](https://www.rfi.com.au/comms-products/antennas/marine) - [Mining](https://www.rfi.com.au/comms-products/antennas/mining) - [RF Components](https://www.rfi.com.au/comms-products/rf-components) - [Cables](https://products.rfi.com.au/cables) - [Connectors](https://products.rfi.com.au/connectors) - [Cellular Passive Components](https://www.rfi.com.au/comms-products/rf-components/cellular-rf-components) - [Loads and Attenuators](https://www.rfi.com.au/comms-products/rf-components/loads-attenuators) - [Lightning Protection](https://www.rfi.com.au/comms-products/rf-components/lightning-protection) - [Phasing Harness](https://www.rfi.com.au/comms-products/rf-components/test-equipment) - [Test Equipment](https://www.rfi.com.au/comms-products/rf-components/test-equipment) - [Grounding](https://www.rfi.com.au/comms-products/rf-components/grounding) - [Coverage Enhancement](https://products.rfi.com.au/en-au/en-au/coverage-enhancement) - [In-Building](https://products.rfi.com.au/en-au/en-au/coverage-enhancement/cel-fi-in-building) - [In-Vehicle](https://products.rfi.com.au/en-au/en-au/coverage-enhancement/cel-fi-in-vehicle) - [Fixed Wireless Access](https://www.rfi.com.au/comms-products/coverage-enhancement/fwa) - [Bury Mobile Phone Car Kits](https://www.rfi.com.au/comms-products/coverage-enhancement/bury-mobile-phone-car-kits) - [AM/FM/DAB Rebroadcast Solutions](https://www.rfi.com.au/comms-products/coverage-enhancement/am-fm-dab-rebroadcast-solutions) - [In-Vehicle Repeaters](https://www.rfi.com.au/comms-products/coverage-enhancement/in-vehicle-repeaters) - [X10DR Out of Vehicle Repeaters](https://www.rfi.com.au/comms-products/coverage-enhancement/x10dr-out-of-vehicle-repeaters) - [Channel Selective BDAS (DSPBR)](https://www.rfi.com.au/comms-products/coverage-enhancement/channel-selective-bdas-dspbr) - [Band Selective BDAS](https://www.rfi.com.au/comms-products/coverage-enhancement/band-selective-bdas) - [Installation Components](https://www.rfi.com.au/comms-products/installation-components) - [Mounting](https://www.rfi.com.au/comms-products/installation-components/mounting) - [Clamps](https://www.rfi.com.au/comms-products/installation-components/clamps) - [Tools](https://www.rfi.com.au/comms-products/installation-components/tools) - [Installation Accessories](https://www.rfi.com.au/comms-products/installation-components/installation-accessories) - [Power Supplies](https://www.rfi.com.au/comms-products/installation-components/power-supplies) - [Data Access (IT/OT)](https://www.rfi.com.au/comms-products/data-acess-iot) - [Modems/Gateways](https://www.rfi.com.au/comms-products/data-acess-iot/modems-gateways) - [RF Data Modems](https://www.rfi.com.au/comms-products/data-acess-iot/rf-data-modem) - [Digital Drift](https://products.rfi.com.au/en-au/digital-drift-industrial) - [Wireless Network](https://www.rfi.com.au/comms-products/data-acess-iot/wireless-network) - [Multicoupling/Monitoring](https://products.rfi.com.au/en-au/en-au/multicoupling-monitoring) - [Receiver Multicouplers](https://products.rfi.com.au/en-au/receiver-multicouplers) - [Tower Top Amplifiers](https://products.rfi.com.au/en-au/tower-top-amplifiers) - [Transmitter Multicouplers](https://products.rfi.com.au/en-au/transmitter-multicouplers) - [Mini System Combiners](https://products.rfi.com.au/minisystem-combiners) - [Transmitter Hybrid Combiners](https://products.rfi.com.au/en-au/transmitter-hybrid-combiners) - [Control Station Combiners](https://products.rfi.com.au/en-au/control-station-combiners) - [Duplexers](https://products.rfi.com.au/en-au/duplexers) - [Filters](https://products.rfi.com.au/en-au/filters) - [Monitoring](https://products.rfi.com.au/en-au/monitoring) - [Multicoupling Components](https://products.rfi.com.au/en-au/multicoupling-components) - [Mounting Hardware](https://products.rfi.com.au/en-au/mounting-hardware) - [Clearance](https://www.rfi.com.au/clearance) - [Energy Products](https://products.rfi.com.au/energy) - [Solar Modules](https://www.rfi.com.au/energy-prods/solar-modules) - [Residential/Commercial](https://www.rfi.com.au/energy-prods/solar-modules/residential-commercial) - [Recreational](https://www.rfi.com.au/energy-prods/solar-modules/recreational) - [Industrial](https://www.rfi.com.au/energy-prods/solar-modules/industrial) - [Regulators & Chargers](https://www.rfi.com.au/energy-prods/energy-regulators) - [Regulators](https://www.rfi.com.au/energy-prods/energy-regulators/regulators) - [Battery Chargers](https://www.rfi.com.au/energy-prods/energy-regulators/battery-chargers) - [DC-DC Converters](https://www.rfi.com.au/energy-prods/energy-regulators/dc-dc-converters) - [Accessories](https://www.rfi.com.au/energy-prods/energy-regulators/accessories) - [DC-DC Chargers](https://www.rfi.com.au/energy-prods/energy-regulators/dc-dc-chargers) - [EV Chargers](https://www.rfi.com.au/energy-prods/energy-regulators/ev-chargers) - [Inverters](https://www.rfi.com.au/energy-prods/energy-inverters) - [Solar Inverters](https://www.rfi.com.au/energy-prods/energy-inverters/solar-inverters) - [Hybrid Inverters](https://www.rfi.com.au/energy-prods/energy-inverters/hybrid-inverters) - [Battery Inverters](https://www.rfi.com.au/energy-prods/energy-inverters/battery-inverters) - [Inverter Accessories](https://www.rfi.com.au/energy-prods/energy-inverters/inverter-accessories) - [Energy Storage](https://products.rfi.com.au/energy-storage-solutions) - [Batteries](https://www.rfi.com.au/energy-prods/energy-storage/batteries) - [Energy Storage Systems](https://www.rfi.com.au/energy-prods/energy-storage/energy-storage-systems) - [Accessories](https://www.rfi.com.au/energy-prods/energy-storage/accessories) - [Balance of System](https://www.rfi.com.au/energy-prods/balance-of-system) - [Racking](https://www.rfi.com.au/energy-prods/balance-of-system/racking) - [Switchgear](https://www.rfi.com.au/energy-prods/balance-of-system/switchgear) - [Protection](https://www.rfi.com.au/energy-prods/balance-of-system/protection) - [Cables & Connectors](https://www.rfi.com.au/energy-prods/balance-of-system/bof-cable-connectors) - [Signage](https://www.rfi.com.au/energy-prods/balance-of-system/signage) - [Communications](https://www.rfi.com.au/energy-prods/balance-of-system) - [Modems](https://www.rfi.com.au/energy-prods/energy-communications/modems) - [Communications Adaptors](https://www.rfi.com.au/energy-prods/energy-communications/communications-adaptors) - [Solar Clearance](https://www.rfi.com.au/energy_clearance) - [Industries](https://products.rfi.com.au/en-au/markets) - [Public Safety](https://products.rfi.com.au/public-safety) - [Health & Aged Care](https://products.rfi.com.au/en-au/connected-health) - [Mining & Resources](https://products.rfi.com.au/mining) - [Marine](https://www.rfi.com.au/comms-products/antennas/marine) - [Transport & Infrastructure](https://products.rfi.com.au/en-au/transport-infrastructure) - [Recreation 4WD & Caravan](https://www.rfi.com.au/4wd-caravan) - Media - [News](https://news.rfi.com.au/listing) - [Case Studies](https://casestudies.rfi.com.au/listing) - [Communications Resources](https://products.rfi.com.au/communicationsresources) - [Energy Resources](https://products.rfi.com.au/energy-resources) - About Us - [Our Capabilities](https://products.rfi.com.au/our-capabilities) - [Our History](https://www.rfi.com.au/our-history) - [Our People](https://www.rfi.com.au/our-people) - [Our Board](https://products.rfi.com.au/our-board-members) - [Our Jobs](https://bit.ly/4eDqMZR) - [Clearance](https://products.rfi.com.au/clearance) [Login](https://www.rfi.com.au/sca-dev-2020-1/checkout.ssp?is=login&login=T&fragment=login-register&_ga=2.76084693.1913000088.1622433919-1321836579.1622433919) - [Services](https://products.rfi.com.au/en-au/service-division) - [Communications Products](https://products.rfi.com.au/communications) - [Antennas](https://www.rfi.com.au/comms-products/antennas) - [Cellular](https://www.rfi.com.au/comms-products/antennas/cellular) - [PMR/LMR](https://www.rfi.com.au/comms-products/antennas/pmr-lmr) - [WI-FI](https://www.rfi.com.au/comms-products/antennas/wifi) - [GPS](https://www.rfi.com.au/comms-products/antennas/gps) - [ISM](https://www.rfi.com.au/comms-products/antennas/ism) - [CB](https://www.rfi.com.au/comms-products/antennas/cb) - [Marine](https://www.rfi.com.au/comms-products/antennas/marine) - [Mining](https://www.rfi.com.au/comms-products/antennas/mining) - [RF Components](https://www.rfi.com.au/comms-products/rf-components) - [Cables](https://products.rfi.com.au/cables) - [Connectors](https://products.rfi.com.au/connectors) - [Cellular Passive Components](https://www.rfi.com.au/comms-products/rf-components/cellular-rf-components) - [Loads and Attenuators](https://www.rfi.com.au/comms-products/rf-components/loads-attenuators) - [Lightning Protection](https://www.rfi.com.au/comms-products/rf-components/lightning-protection) - [Phasing Harness](https://www.rfi.com.au/comms-products/rf-components/phasing-harness) - [Test Equipment](https://www.rfi.com.au/comms-products/rf-components/test-equipment) - [Grounding](https://www.rfi.com.au/comms-products/rf-components/grounding) - [Coverage Enhancement](https://products.rfi.com.au/en-au/en-au/coverage-enhancement) - [In-Building](https://products.rfi.com.au/en-au/en-au/coverage-enhancement/cel-fi-in-building) - [In-Vehicle](https://products.rfi.com.au/en-au/en-au/coverage-enhancement/cel-fi-in-vehicle) - [Fixed Wireless Access](https://www.rfi.com.au/comms-products/coverage-enhancement/fwa) - [Bury Mobile Phone Car Kits](https://www.rfi.com.au/comms-products/coverage-enhancement/bury-mobile-phone-car-kits) - [AM/FM/DAB Rebroadcast Solutions](https://www.rfi.com.au/comms-products/coverage-enhancement/am-fm-dab-rebroadcast-solutions) - [In-Vehicle Repeaters](https://www.rfi.com.au/comms-products/coverage-enhancement/in-vehicle-repeaters) - [X10DR Out of Vehicle Repeaters](https://www.rfi.com.au/comms-products/coverage-enhancement/x10dr-out-of-vehicle-repeaters) - [Channel Selective BDAS (DSPBR)](https://www.rfi.com.au/comms-products/coverage-enhancement/channel-selective-bdas-dspbr) - [Band Selective BDAS](https://www.rfi.com.au/comms-products/coverage-enhancement/band-selective-bdas) - [Installation Components](https://www.rfi.com.au/comms-products/installation-components) - [Mounting](https://www.rfi.com.au/comms-products/installation-components/mounting) - [Clamps](https://www.rfi.com.au/comms-products/installation-components/clamps) - [Tools](https://www.rfi.com.au/comms-products/installation-components/tools) - [Installation Accessories](https://www.rfi.com.au/comms-products/installation-components/installation-accessories) - [Power Supplies](https://www.rfi.com.au/comms-products/installation-components/power-supplies) - [Data Access (IT/OT)](https://www.rfi.com.au/comms-products/data-acess-iot) - [Modems/Gateways](https://www.rfi.com.au/comms-products/data-acess-iot/modems-gateways) - [RF Data Modems](https://www.rfi.com.au/comms-products/data-acess-iot/rf-data-modem) - [Digital Drift](https://www.rfi.com.au/comms-products/data-acess-iot/digital-drift) - [Wireless Network](https://www.rfi.com.au/comms-products/data-acess-iot/wireless-network) - [Multicoupling/Monitoring](https://products.rfi.com.au/en-au/en-au/multicoupling-monitoring) - [Receiver Multicouplers](https://products.rfi.com.au/en-au/receiver-multicouplers) - [Tower Top Amplifiers](https://products.rfi.com.au/en-au/tower-top-amplifiers) - [Transmitter Multicouplers](https://products.rfi.com.au/en-au/transmitter-multicouplers) - [Mini System Combiners](https://products.rfi.com.au/minisystem-combiners) - [Transmitter Hybrid Combiners](https://products.rfi.com.au/en-au/transmitter-hybrid-combiners) - [Control Station Combiners](https://products.rfi.com.au/en-au/control-station-combiners) - [Duplexers](https://products.rfi.com.au/en-au/duplexers) - [Filters](https://products.rfi.com.au/en-au/filters) - [Monitoring](https://products.rfi.com.au/en-au/monitoring) - [Multicoupling Components](https://products.rfi.com.au/en-au/multicoupling-components) - [Mounting Hardware](https://products.rfi.com.au/en-au/mounting-hardware) - [Clearance](https://www.rfi.com.au/clearance) - [Energy Products](https://products.rfi.com.au/energy) - [Solar Modules](https://www.rfi.com.au/energy-prods/solar-modules) - [Residential/Commercial](https://www.rfi.com.au/energy-prods/solar-modules/residential-commercial) - [Recreational](https://www.rfi.com.au/energy-prods/solar-modules/recreational) - [Industrial](https://www.rfi.com.au/energy-prods/solar-modules/industrial) - [Regulators & Chargers](https://www.rfi.com.au/energy-prods/energy-regulators) - [Regulators](https://www.rfi.com.au/energy-prods/energy-regulators/regulators) - [Battery Chargers](https://www.rfi.com.au/energy-prods/energy-regulators/battery-chargers) - [DC-DC Converters](https://www.rfi.com.au/energy-prods/energy-regulators/dc-dc-converters) - [Accessories](https://www.rfi.com.au/energy-prods/energy-regulators/accessories) - [DC-DC Chargers](https://www.rfi.com.au/energy-prods/energy-regulators/dc-dc-chargers) - [EV Chargers](https://www.rfi.com.au/energy-prods/energy-regulators/ev-chargers) - [Inverters](https://www.rfi.com.au/energy-prods/energy-inverters) - [Solar Inverters](https://www.rfi.com.au/energy-prods/energy-inverters/solar-inverters) - [Hybrid Inverters](https://www.rfi.com.au/energy-prods/energy-inverters/hybrid-inverters) - [Battery Inverters](https://www.rfi.com.au/energy-prods/energy-inverters/battery-inverters) - [Inverter Accessories](https://www.rfi.com.au/energy-prods/energy-inverters/inverter-accessories) - [Energy Storage](https://products.rfi.com.au/energy-storage-solutions) - [Batteries](https://www.rfi.com.au/energy-prods/energy-storage/batteries) - [Energy Storage Systems](https://www.rfi.com.au/energy-prods/energy-storage/energy-storage-systems) - [Accessories](https://www.rfi.com.au/energy-prods/energy-storage/accessories) - [Balance of System](https://www.rfi.com.au/energy-prods/balance-of-system) - [Racking](https://www.rfi.com.au/energy-prods/balance-of-system/racking) - [Switchgear](https://www.rfi.com.au/energy-prods/balance-of-system/switchgear) - [Protection](https://www.rfi.com.au/energy-prods/balance-of-system/protection) - [Cables & Connectors](https://www.rfi.com.au/energy-prods/balance-of-system/bof-cable-connectors) - [Signage](https://www.rfi.com.au/energy-prods/balance-of-system/signage) - [Communications](https://www.rfi.com.au/communication) - [Modems](https://www.rfi.com.au/energy-prods/energy-communications/modems) - [Communications Adaptors](https://www.rfi.com.au/energy-prods/energy-communications/communications-adaptors) - [Solar Clearance](https://www.rfi.com.au/energy_clearance) - [Industries](https://products.rfi.com.au/en-au/markets) - [Public Safety](https://products.rfi.com.au/public-safety) - [Health & Aged Care](https://products.rfi.com.au/en-au/connected-health) - [Mining & Resources](https://products.rfi.com.au/mining) - [Marine](https://www.rfi.com.au/comms-products/antennas/marine) - [Transport & Infrastructure](https://products.rfi.com.au/en-au/transport-infrastructure) - [Recreation 4WD & Caravan](https://www.rfi.com.au/4wd-caravan) - Media - [News](https://www.rfi.com.au/news-release) - [Case Studies](https://casestudies.rfi.com.au/listing) - [Communications Resources](https://products.rfi.com.au/communicationsresources) - [Energy Resources](https://products.rfi.com.au/energy-resources) - About Us - [Our Capabilities](https://products.rfi.com.au/our-capabilities) - [Our History](https://www.rfi.com.au/our-history) - [Our People](https://www.rfi.com.au/our-people) - [Our Board](https://products.rfi.com.au/our-board-members) - [Our Jobs](https://bit.ly/4eDqMZR) - [Find a dealer](https://www.rfi.com.au/stores) - [Quick Order](https://www.rfi.com.au/cart?openQuickOrder=true) - [Track Order](https://www.smartfreight.com/tracking) ![Communications header](https://products.rfi.com.au/hubfs/Communications%20header%20(1).png) # Underground Communications ## UNDERGROUND COMMUNICATIONS SOLUTIONS RFI Technology Solutions delivers the only Australian manufactured integrated radio rebroadcast system. This includes small to large systems for both metropolitan and rural applications, as well as macro/micro sized projects for in-building or other application-specific solutions. ![1. Northern Compound construction](https://products.rfi.com.au/hubfs/1.%20Northern%20Compound%20construction.jpg "1. Northern Compound construction") ![RFI\_Sydney\_Hills\_M2\_Tunnel\_Upgrade\_thumb](https://products.rfi.com.au/hs-fs/hubfs/RFI_Sydney_Hills_M2_Tunnel_Upgrade_thumb.jpg?width=555&height=299&name=RFI_Sydney_Hills_M2_Tunnel_Upgrade_thumb.jpg "RFI_Sydney_Hills_M2_Tunnel_Upgrade_thumb") ## OUR SOLUTIONS Our solutions are designed and deployed across a diverse range of customer environments:  - Rail and road tunnels - Hospitals - Mines - Airports ## OUR DEPLOYED SOLUTIONS - The new M4 tunnel, Sydney - Rail infrastructure corporation (various rail tunnels and railway stations) - City Circle underground rail tunnels, Sydney - Melbourne Circle underground rail link - State Rail NSW - Kiama Rail Tunnel, Wollongong - Mullum Mullum (Eastlink) Tunnel, Melbourne - BHP Rail Tunnels and Ore Dumpers - CityLink Tunnels, Melbourne - Route 8 Tunnels, Hong Kong - Sydney Harbour Tunnel - Eastern Suburbs Rail Underground Link, Sydney - Lane Cove Tunnel, Sydney - M2 Tunnel, Sydney - Crafers (Heysen) Tunnel, Adelaide - Farmer Tunnel, Perth - Wellington War Memorial Tunnel, NZ - Airport Link Tunnel, Brisbane - Illawarra Underground Link, Sydney - The new M5 WestConnex, Sydney ![M2 Tunnel](https://products.rfi.com.au/hubfs/M2%20Tunnel.jpg "M2 Tunnel") --- ## Get in touch with our team We can guide you on a complete solution to your underground communications requirements. \* By submitting this form, you agree to receive marketing emails and communications from RFI. You can unsubscribe at any time and your data will be handled in accordance with our Privacy Policy. #### SUPPORT - [**1300 000 734**](tel:%201300%20000%20734) - [enquiry@rfi.com.au](mailto:enquiry@rfi.com.au) #### MY ACCOUNT - [My Account](https://www.rfi.com.au/sca-dev-2020-1/my_account.ssp?fragment=overview&_ga=2.100923713.1913000088.1622433919-1321836579.1622433919) - [Sign In](https://www.rfi.com.au/sca-dev-2020-1/checkout.ssp?is=login&login=T&fragment=login-register&_ga=2.100923713.1913000088.1622433919-1321836579.1622433919) - [View Cart](https://www.rfi.com.au/cart) - [Register](https://www.rfi.com.au/sca-dev-2020-1/checkout.ssp?is=register&login=T&reset=T&newcust=T&fragment=login-register&_ga=2.100923713.1913000088.1622433919-1321836579.1622433919) #### INFORMATION - [Contact Us](https://www.rfi.com.au/contact) - [Policies](https://www.rfi.com.au/policies) - [Privacy Policy](https://www.rfi.com.au/privacy-policy) - [Terms of Sale](https://www.rfi.com.au/terms-and-conditions) - [Warranty Terms & Conditions](https://www.rfi.com.au/warranty-terms-and-conditions) - [Website Terms of Use](https://www.rfi.com.au/website-terms-of-use) #### FOLLOW US - [Linkedin](https://www.linkedin.com/company/rfitechnologysolutions) - [Facebook](https://www.facebook.com/RFITechnologysolutions) - [Instagram](https://www.instagram.com/rfiantennas) - [YouTube](https://www.youtube.com/channel/UC8-6F32PpX8VjDJhNFKez_Q/featured) #### Newsletter Back to top