DISTRIBUTED ANTENNA SYSTEMS

Distributed Antenna Systems (DAS) improve wireless connectivity by placing antennas throughout a building. There are two main types of DAS. Cellular DAS enhances mobile network coverage, while Public Safety DAS, also known as Emergency Responder Communication Enhancement Systems (ERCES), ensures reliable communication for emergency responders.

CELLULAR DAS

A Distributed Antenna System (DAS) is designed to enhance cellular connectivity and coverage in areas where traditional cell tower signals struggle to penetrate, such as large buildings, stadiums, or campuses. Cellular DAS consists of a network of spatially separated antenna nodes connected to a central source via a transport medium. The Buist team will conduct a survey at your facility to assess current cellular service, review the findings with your team, and explore the best solution options to improve coverage.

Donor DAS

A Donor DAS operates as a repeater by capturing the existing cellular tower signal and transmitting it through FCC-approved devices and antennas.

Backhaul DAS

Backhaul DAS directly connects to the carrier’s network via a hardline, typically using fiber and provides a more consistent and reliable connection because it directly interfaces with the carriers’ network.

PUBLIC SAFETY DAS

Public Safety DAS is designed to improve in-building radio coverage for emergency responders, operating on the 700/800 MHz frequency bands. In many structures, especially those with thick walls or underground areas, radio signals can become weak or blocked. Public Safety DAS addresses this by distributing signals throughout the building, ensuring that first responders maintain clear and reliable communication during emergencies. This system is often required by fire and building codes to support life safety and is typically reviewed and approved by the authority having jurisdiction (AHJ).

Compliance

New buildings must provide 95–100% in-building radio coverage for first responders
100% coverage is required in critical areas such as stairwells, pump rooms, and fire command centers
Renovated buildings must meet the same coverage thresholds to receive re-occupancy approval
Systems must support public safety frequencies, Michigan requires 700 MHz and 800 MHz
Annual ERCES inspections are mandated to verify ongoing system performance
Non-compliance (under OFC 510 and NFPA 72) may result in civil or criminal penalties, as determined by the local authority having jurisdiction (AHJ)

Why It Matters

Critical Communication Access: Enhances radio signal strength in traditionally poor coverage zones like basements and mechanical spaces, enabling consistent communication for emergency crews
Reduces Emergency Response Risks: Improves coordination during emergencies, which can directly impact rescue speed and situational control
Streamlined Emergency Operations: A properly functioning Public Safety DAS allows fire, police, and EMS personnel to use their radios effectively without relying on cellular or external networks
Inspection Readiness: Helps building owners pass system functionality inspections with confidence and minimize delays during construction or renovation closeouts
Preparedness Assurance: Provides building occupants and managers with confidence that the space is equipped to handle emergency communications during crises
Code Compliance & Legal Protection: Demonstrates adherence to national fire and building codes (NFPA 1225, UL 2524, and, IFC Section 510), helping owners avoid costly fines, delays, or legal liabilities
Meets AHJ Requirements: Systems are evaluated and approved by the local authority having jurisdiction (AHJ), which is critical for obtaining and maintaining occupancy permits

The Buist Advantage

Single point of responsibility
Quick response to change
Cost tracking and budget management
60+ years of experience
Attention to detail
Design with quality and value in mind
Continuous communication between owner, construction manager, design team, and installers

OUR PROVEN PROCESS

Our DAS process is based on years of industry experience and proven best practices, ensuring consistent, high-quality system performance, and reliable connectivity for our clients.

SURVEY

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We start with a grid test to evaluate the building’s existing coverage from all three major wireless carriers.

REPORT

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Next, we generate a comprehensive report that outlines signal strength levels.

DESIGN

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Based on the survey results and coverage report, we design a custom Distributed Antenna System tailored to the building’s layout and specific requirements.

INSTALLATION

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Our technicians install the system with minimal disruption, using industry best practices and certified equipment.

INSPECTION

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We schedule and support the required authority having jurisdiction (AHJ) inspection to ensure the system meets all code standards.

COMPLETION

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A post-installation survey has confirmed full system coverage and code compliance. Final documentation including the comprehensive report, system map, and post-survey comparison has been submitted. The system is now officially registered with the State of Michigan. Buist will provide ongoing annual servicing and maintenance.

Markets We Serve

Commercial Projects

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Industrial Projects

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Healthcare Projects

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Education Projects

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House of Worship Projects

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Markets We Serve

Commercial Projects

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Industrial Projects

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Healthcare Projects

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Education Projects

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House of Worship Projects

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PRODUCT PARTNERS

We work with leading DAS product partners to ensure reliable coverage, critical area protection, and full code compliance. Each system is expertly designed, installed, and supported through ongoing maintenance and testing. Our team is certified by Nextivity, demonstrating proven expertise in deploying high-performance in-building communication systems.

OUR PRODUCT PARTNERS

FEATURED CASE STUDIES

Lumbermen’s

Lumbermen’s Inc. cellular signal failure resolved with a Distributed Antenna System.

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Buist HQ

Buist identified a critical need to improve emergency communication capabilities within our headquarters.

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LET'S GET STARTED

Contact our Distributed Antenna System department today. One of our team members will get back in touch with you.