More about Ubiquiti airMAX ac Antennas

Ubiquiti airMAX ac Antennas: UMA-D and PowerBeam 5AC Gen2

The airMAX ac product family from Ubiquiti offers robust and high-performance solutions for outdoor wireless networks, with the PowerBeam 5AC Gen2 and UMA-D models serving two diametrically opposed use cases: point-to-point bridging and sector coverage.

PowerBeam 5AC Gen2: The High-Performance Wireless Bridge

The PowerBeam 5AC Gen2 (PBE-5AC-Gen2) is an integrated airMAX ac CPE (Customer Premises Equipment) and is considered the industry standard for Point-to-Point (PtP) connections over medium to long distances.

  • Purpose: The PowerBeam primarily serves to wirelessly network two separate locations (buildings, halls, etc.). It replaces a conventional network cable connection.

  • Technology: It operates in the 5 GHz frequency band and utilizes the proprietary airMAX ac protocol, which offers significantly higher throughput (up to 450+ Mbps) and lower latency compared to conventional Wi-Fi through TDMA (Time Division Multiple Access).

  • Antenna Design: The PowerBeam features an integrated directional antenna (up to 25 dBi) with an extremely narrow beamwidth. This focused design is crucial for:

    • Range: Bridging distances up to 25 km (depending on EIRP regulations and environmental factors).

    • Noise Immunity: The tight beam filtering out radio interference from other directions, enabling a more stable connection in high-density environments.

  • Management: The PowerBeam is managed via the airOS operating system and features a dedicated management Wi-Fi radio for easy setup and alignment via the UISP Mobile app.

UMA-D: Sectoral Range Extension

The UniFi AC Mesh Antenna (UMA-D) is not a standalone bridge, but a dual-band (2.4 GHz and 5 GHz) sector antenna serving as an accessory for specific UniFi AC Mesh Access Points (such as the UAP-AC-M).

  • Purpose: The UMA-D extends the range and coverage area of a UniFi Mesh Access Point in a specific direction. It converts the omnidirectional radiation of the Mesh AP into directional, sectoral coverage.

  • Technology: It is a passive dual-band antenna connected via RP-SMA connectors to the UniFi AP. It supports 2.4 GHz and 5 GHz Wi-Fi (IEEE 802.11ac standard) simultaneously.

  • Radiation Characteristics: Unlike the PowerBeam, which generates an extremely narrow beam, the UMA-D radiates in a broader, sector-shaped pattern:

    • 2.4 GHz: Wide sector (typically 90° beamwidth, 10 dBi gain).

    • 5 GHz: Narrower sector (typically 45° beamwidth, 15 dBi gain).

    • This is ideal for covering open spaces like parking lots, outdoor seating, or specific corridors.

  • Management: Configuration is done via the UniFi Controller, as it is an accessory of a UniFi device.


Conclusion: Two Worlds of Wireless Connectivity

The PowerBeam 5AC Gen2 creates a fixed high-speed link (PtP) that must be precisely aligned, while the UMA-D optimizes and extends the wide-area Wi-Fi coverage of UniFi networks in a specific sector.