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BDA and DAS In Building Wireless Device Coverage

Improve safety and productivity with Bi-Directional Amplifiers & Distributed Antenna Systems & services from SJM Industrial Radio.

In Building Wireless Device Coverage from SJM Industrial Radio

Improve Safety and Productivity With Bi-Directional Amplifiers & Distributed Antenna Systems & Services

In-building coverage is a problem that affects everyone as most business operate in environments that can block or diminish radio signals. Concrete, steel and other physical barriers can create communication dead zones where cell service and two way radios do not work. Whether you’re a first responder using your radio in a building, a customer using their cell phone, or an employee communicating in your facility, having reliable indoor communication is critical for safety and productivity. Signal interference is the number one reason why people have difficulty staying connected inside buildings and it’s also why first responders can’t communicate effectively with each other or dispatch during emergencies. These solutions are complex and require proper engineering, design, analysis and installation.

BDA & DAS In-Building Coverage solutions and services from SJM Industrial Radio provides better indoor wireless device coverage. With over 30 years of experience you can trust SJM experts to help you design the in building solution that’s right for you; from wireless signal boosters for cellular service to repeaters and BDA antennas for reliable two-way radio coverage in challenging environments. This means fewer dropped calls, no dead zones, and an improved overall user experience. SJM Industrial Radio works with you through the process of designing, installing, and maintaining high-performance signal boosters. We will also explain the requirements in Los Angeles for first responder radio communications coverage in buildings.

In building systems can be custom engineered for any type of business environment where enhanced coverage and communication is needed:

  • Large Buildings
  • Wide Coverage areas
  • Underground Structures (parking garages, basements)
  • Hospitals
  • Sports Stadiums & Arenas
  • Shopping Malls
  • Airports
  • Convention Centers
  • Manufacturing Plants and Warehouses
  • Schools and University Campuses


Learn How In Building Solutions From SJM Radio Can Help Your Business Operations

SJM Radio in building solutions

If radio coverage in your facility is a problem, then your staff can’t get their job done effectively, and it could also cause safety issues. The problem is that many companies are finding it difficult to find reliable and dependable radio coverage in buildings. This means that your staff will be unable to communicate efficiently, causing lost productivity and safety concerns. In building systems can be custom engineered for any type of business environment where enhanced coverage and communication is needed.


The backbone of your MOTOTRBO two-way radio system. Repeaters ensure your radio network is available at all times and that communications are clear, reliable and secure across your business environment.

Signal Boosters / Bi-directional Amplifiers

“Signal Boosters”, Bi-Directional Amplifiers (BDA) or Distributed Antenna Systems (DAS) can bring wireless signals in from outside your structure, amplify the signal and then evenly distribute that signal throughout the structure.


Combiners take multiple radio frequency RF inputs and combine them in a single antenna output.

RF Filters

Enhances audio and detects signals coming from outside of your system. Reduces interference and maximizes the effectiveness of you communications system.


Allows transmission and receiving over a single path. It isolates the receiver from the transmitter but allows them to use the same antenna. Duplexers help manage signals to ensure your communication is consistent and reliable.

Having an effective communication system not only improves productivity and customer service, it also greatly increases the safety of first responders, staff, tenants, and customers that use your facility! 

Contact us today for more information about our in building solutions. 

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