Shure UA221 Passive Splitter Kit

The UA221 is Shure's answer to a specific, common problem: you have one antenna pair in a good position and two receivers that need to see it. Each unit is a passive BNC barrel splitter — one input, two outputs, no electronics, no power, no rack space consumed. Shure sells them in pairs so you can cover both the A and B diversity legs of a two-receiver system in a single purchase. It's not a distro in the full sense; it's a signal-sharing junction that gets out of the way and costs almost nothing to own or operate.

Passive splitting means a roughly 3 dB loss on each output leg — you're dividing signal power, not amplifying it. In a strong RF environment with short cable runs, that loss lands well within the sensitivity headroom of any current Shure receiver and most competing hardware. Where it becomes a real consideration is at the edge of range, in dense RF environments, or when you're running long BNC cable back to the rack. The UA221 has no depth to speak of and zero power draw, so it doesn't care where it sits in the cable chain — but physics still cares how far the signal has already traveled before it splits.

This is the right tool for a two-receiver IEM or wireless mic rig where budget and simplicity are priorities and your antennas are close to the rack or pointed at a compact stage. If you're running three or more receivers off a single antenna pair, stop here and look at an active antenna distro — passive splitting compounds losses with every tap. Similarly, if you're working long cable runs or a crowded RF environment, the 3 dB you're giving up may matter more than the price difference between this and an active solution. For a clean two-way split in a small rig, though, it's hard to argue with something this simple.