— Installer Guide
Gallagher SMB
External 4G Antenna
The Gallagher SMB cellular module uses a standard SMA Female antenna port for 4G communications. When the internal antenna isn't delivering reliable signal — metal cabinets, basement access points, fringe sites — this guide covers the right external antenna and cable for the Gallagher SMB.
SMA
Connector Type
T11 / SMB
Module Series
6 dBi
Gain Available
IP65
Outdoor Rated
About the Gallagher SMB Cellular Module
The Gallagher SMB (Small to Medium Business) security controller is widely deployed in Australian commercial premises for integrated access control, intruder detection, and building management. The optional cellular module adds 4G connectivity, providing the primary or backup communications path to monitoring stations and remote management platforms.
The SMB cellular module features an SMA Female external antenna port. The supplied stub antenna performs adequately in open environments, but attenuates significantly inside metal enclosures or shielded building structures — requiring an external antenna for reliable communications.
Gallagher SMB Cellular Module — Antenna Port
Common installation scenarios
Steel cabinet shielding
Gallagher SMB controllers are commonly installed in steel distribution boards or purpose-built metal enclosures. The enclosure walls attenuate the cellular signal by 15–25 dB — enough to cause supervision faults or monitoring failures. An external SMA antenna exiting the cabinet via a gland restores full signal.
Multi-site commercial access control
Gallagher SMB is frequently deployed across multi-site retail, franchise, and professional services premises. Cellular reliability is critical for remote door management and alarm response. An external antenna on each site eliminates location-dependent signal problems.
Basement and underground car park entry
Access control points in basement car parks and loading docks sit below street level where 4G penetration is poor. Route a low-loss coaxial from the Gallagher SMB controller through conduit to an external omni at ground level for reliable monitoring and remote access management.
Industrial premises and warehouses
Steel and concrete warehouse structures attenuate cellular signals significantly. A 6 dBi external omni mounted outside the structure — on an eave or roof parapet — provides the link margin required for uninterrupted access control and alarm communications.
Recommended D&G Products for Gallagher SMB
All antennas and cable assemblies individually tested. Custom cable assemblies quoted to site drawings.
DG900MB-HG — 5GNR Broadband Omni
Primary recommendation for Gallagher SMB cellular module installations. 6 dBi mid-band gain recovers signal in metal cabinets, basement plant rooms, and steel-framed buildings. Wall or pole bracket mount. Connect to the SMB cellular module SMA Female port via an SMA Male to N Male pigtail.
DGY900-6 — Yagi Directional Antenna
For remote commercial or rural sites with a known tower direction. 11 dBi at high-band LTE provides substantial link margin where standard antennas fail to hold a connection. Point toward nearest Telstra or Optus tower. Suited to outer-metro industrial premises and fringe rural commercial sites.
SMA Male to N Male Pigtail
Adapts the Gallagher SMB cellular module SMA Female port to the N Female port on D&G external antennas. 30 cm standard length — routes through the cabinet wall knockout or gland. Custom lengths available for installations requiring longer runs inside the enclosure.
Custom Cable Assembly
Low-loss LMR240 or LMR400 coaxial for cable runs through conduit, cable trays, and risers. Built to your site specification with SMA or N at each end. LMR400 recommended for runs over 10 m to keep insertion loss below 1 dB.
Why Gallagher installers specify D&G
100% tested, not sampled
Every antenna and cable assembly is tested on an Anritsu Site Master before dispatch. A bad antenna on a commercial access control site is a callback and a failed audit — we eliminate that risk at source.
OEM supplier to the monitoring industry
Our antennas are inside ADT, Johnson Controls, and Wormald monitoring infrastructure across Australia. The same build quality and test standard is in every product we supply to Gallagher installers.
Custom cable assemblies to any length
We build SMA and N connector cable assemblies in any length. LMR240 for standard runs, LMR400 for long cable paths where insertion loss is critical to maintaining signal margin.
Stocked in Penrith, same-day available
No import delays. Call ahead for same-day collection from our Penrith warehouse. 2-week lead time for custom cable assemblies built to your site specification.
— Get a Quote
Procurement
Made Simple
Submit your requirements below. Our engineering team responds within 1 business day with pricing and lead times.
Why quote through Xtend?
D&G Antennas — OEM supplier to ADT, JCI, Cardtronics, and Elsema. Direct to your project.
Direct to the Manufacturer
D&G Antennas makes the product. Your quote goes to the source — not a distributor or call centre.
200–500 Units Is Our Normal
Strategic pricing at 50+ units. Volume orders are our standard business — we won't blink at your quantity.
Custom Assemblies to Spec
Non-catalogue cable runs, frequency-tuned antennas, custom connector types. Quoted against your system drawings.
1-Day Response
We supply ADT, JCI, and Cardtronics — we understand what a procurement deadline means. Response within 1 business day.
50+ Units
Strategic discount applies automatically at 50 units per line item. Account pricing available for ongoing procurement.