Shure UA874XA – Active Directional Antenna with Gain Switch 902–960 MHz

Product Overview

The Shure UA874XA is an active directional antenna for Shure wireless systems operating in the 902–960 MHz frequency range, covering the X52 band and 900 MHz ISM/DECT spectrum used by Axient Digital and ULX-D systems. Using a log periodic dipole array, it delivers 7.5 dBi on-axis gain with a 70° 3 dB beam width and four switchable gain settings (−6 dB to +12 dB) for precise cable loss compensation. For commercial AV integrators deploying Shure wireless systems in the 902–960 MHz band, the UA874XA is the correct active directional antenna for rack-to-antenna infrastructure.

Product Description

The 902–960 MHz frequency band is increasingly important in commercial wireless system design, as it offers spectrum options in regions where lower UHF bands face greater congestion or regulatory pressure. The UA874XA is specifically designed for this band, providing directional active antenna infrastructure for Shure wireless receivers with X52 band assignments. The log periodic dipole array concentrates RF coverage toward the intended transmitter location, while the switchable gain control allows the integrator to dial in the correct gain for the cable run length without overgaining the system — a common cause of reduced range and interference in commercial wireless deployments. The integrated swivel adapter supports stand, ceiling, or wall mounting. The UA874XA requires 10–15 V DC bias at 75 mA through the coaxial cable from a connected Shure receiver or antenna distribution system. For large systems, the UA874XA pairs with the Shure UA845UWB Antenna Distribution System.

Key Features

• Log Periodic Dipole Array for 902–960 MHz — Provides a cardioid-pattern directional reception characteristic tuned to the 902–960 MHz band, improving signal capture from transmitters while rejecting off-axis RF interference.
• 7.5 dBi On-Axis Antenna Gain — Delivers 7.5 dBi antenna gain on-axis, providing substantial signal margin improvement over passive or omnidirectional antenna alternatives in commercial wireless installations.
• 70° 3 dB Beam Width — The 70-degree beam provides practical directional coverage for conference rooms, boardrooms, and similar commercial spaces without requiring highly precise aiming.
• Four-Position Switchable Signal Gain (−6 to +12 dB) — Allows precise compensation for coaxial cable loss at +12 dB, +6 dB, 0 dB, or −6 dB (±1 dB) settings, matching gain to the specific cable run in the commercial installation.
• Integrated Swivel Mount Adapter — Enables microphone stand, ceiling, or wall mounting without additional hardware, supporting diverse commercial AV installation configurations.
• RF Overload LED — Provides a visual alert when the antenna amplifier is receiving an excessively strong RF signal, enabling technicians to adjust gain settings or transmitter proximity during commissioning.
• BNC Female Connector, 50 Ω — Standard BNC termination at 50 Ω impedance for direct connection to Shure wireless receivers and antenna distribution systems.

Typical Applications

• Conference room
• Boardroom
• Government space
• House of worship
• Broadcast studio
• Auditorium
• Multi-purpose room
• Training room

Technical Specifications

Frequently Asked Questions

Does the UA874XA require power?
Yes. The UA874XA requires 10–15 V DC bias at 75 mA through the coaxial cable from a compatible Shure wireless receiver or antenna distribution system. The antenna does not operate without this bias voltage, even at the −6 dB and 0 dB gain settings.

What Shure wireless systems use the 902–960 MHz band covered by the UA874XA?
The 902–960 MHz band corresponds to the X52 frequency assignment in Shure ULX-D and other wireless systems. This band is also used by certain Axient Digital configurations. Consult your specific receiver’s frequency band designation to confirm compatibility.

How do I select the correct gain setting on the UA874XA?
Calculate the expected signal loss for your antenna cable run using the cable manufacturer’s per-100-foot loss specification, then select the gain setting closest to that loss value. Avoid adding gain beyond what is needed to compensate for cable loss, as excess gain amplifies RF interference and can reduce system performance.

Can the UA874XA be used in a permanent installation?
Yes. The UA874XA can be permanently mounted on a stand, wall, or ceiling using the integrated swivel adapter. It should not be installed in permanent outdoor locations or environments with extreme moisture.