The Shure UA874WB is an active log-periodic directional antenna covering 470-900MHz, the paddle that points 7.5dBi of gain at the stage while its built-in low-noise amplifier cancels out the coax run. A four-position gain switch (+12 to -6dB) matches it to short jumpers or long installs, on a mic-stand thread with integral swivel bracket.
Features
Active log-periodic directional paddle
470-900MHz wideband, 70° beamwidth
7.5 dBi axial gain plus switchable amplifier (+12/+6/0/-6dB)
Mic-stand thread and swivel wall/ceiling bracket
RF overload protection (>30dBm OIP3)
NoteRequires DC bias from the receiver or distro to operate, even at the 0dB setting.
Specifications
| Type | Active directional antenna |
| SKU | UA874WB |
| Frequency range | 470-900MHz |
| Antenna gain | 7.5 dBi axial |
| Beamwidth | 70° (-3dB) |
| Amplifier | +12 / +6 / 0 / -6dB switchable |
| Connector | BNC female, 50Ω |
| Power | 10-15V DC bias via coax (required), 75mA |
| Dimensions | 316mm x 359mm x 36mm, 317g |





