Description
The Shure UA874US is an active directional UHF antenna designed to improve wireless microphone signal reception in demanding RF environments. Its log periodic dipole array configuration produces a focused 70-degree cardioid reception pattern, rejecting interference from outside the desired coverage area — critical for reliable wireless performance in RF-heavy NYC venues.
Key Features
- Directional cardioid pattern — 70-degree reception angle focuses on the stage and rejects interference from walls, other wireless systems, and LED video walls
- Integrated switchable amplifier — Four gain settings (+12 dB, +6 dB, 0 dB, -6 dB) to compensate for long cable runs or optimize signal-to-noise ratio
- 470–698 MHz frequency range — Covers the full UHF band used by Shure ULXD, QLXD, Axient Digital, and PSM systems
- Multiple mounting options — Stand mount, ceiling suspension, or wall mount with included swivel bracket
- RF overload LED — Visual indicator at -5 dBm threshold prevents front-end overload in dense RF environments
When You Need It
Standard omnidirectional antennas work fine in simple setups. But for events with multiple wireless channels, long antenna-to-receiver distances, or venues with heavy RF interference (LED walls, digital signage, other wireless systems), the UA874US is essential. We recommend it for:
- Multi-channel wireless microphone deployments (4+ channels)
- Large venues with 100+ foot cable runs between antennas and receivers
- Events near LED video walls, which generate significant RF noise
- Concert and festival stages with dense wireless traffic
- Corporate conferences in Manhattan hotels with competing wireless systems
Technical Specifications
| Frequency Range | 470–698 MHz |
| Reception Pattern | 70° cardioid |
| Antenna Gain (On-Axis) | 7.5 dBi |
| Signal Gain (Switchable) | +12 dB, +6 dB, 0 dB, -6 dB |
| Connector | BNC Female |
| Impedance | 50 ohms |
| Power | 10–15 V DC bias via coaxial, 75 mA |
| Third-Order Intercept | >30 dBm |
| Dimensions | 14.1″ W × 12.4″ H × 1.4″ D |
| Weight | 0.7 lbs |
Pair with Shure ULXD, QLXD, or Axient Digital wireless systems for maximum range and reliability. Request a quote or call (718) 218-5941.
