Shure UA874US Active Directional Antenna for VHF and UHF Wireless Systems

Optimize wireless signal reliability and reduce RF interference with the Shure UA874US Active Directional Antenna. Designed for pro AV, security and surveillance applications, this antenna concentrates reception into a cardioid pattern to prioritize coverage where you need it and reject signals from unwanted directions. The UA874US uses a log‑periodic dipole array and covers 470–698 MHz to support a broad range of VHF/UHF wireless systems and RF monitoring equipment. An integrated amplifier with four gain settings compensates for coaxial cable loss, delivering consistent RF levels to receivers even over long cable runs. Rugged construction and flexible mounting options — stand, ceiling, or wall with the included swivel adapter bracket — make installation fast and adaptable across venues, broadcast sites, and security monitoring points. By improving signal-to-noise and reducing dropouts, the UA874US helps ensure dependable audio and data for wireless microphones, IEMs, and surveillance receivers. Add the Shure UA874US to your equipment rack to enhance coverage and simplify RF management in your next installation or monitoring deployment.

• Improves wireless reliability by focusing RF energy into a cardioid coverage pattern, reducing interference for live events and security systems
• Built-in amplifier with four gain settings compensates for coaxial cable loss, maintaining consistent reception across long cable runs
• Log-periodic dipole array rejects unwanted signals outside the coverage area for cleaner audio and more reliable monitoring
• Wide VHF/UHF coverage (470–698 MHz) ensures compatibility with professional wireless mic, IEM and security receivers
• Versatile mounting (stand, ceiling, or wall) with included swivel adapter bracket simplifies installation in venues and surveillance deployments