Shure UA221DB-RSMA - RSMA Dual Band Passive Antenna Splitter. Shure - UA221DB-RSMA - RSMA Dual Band Passive Antenna Splitter for Use with GLXD4R+ Rackmount Receivers. The Shure UA221DB-RSMA splits an incoming signal into two outgoing signals, allowing two GLXD4R+ receivers to share a single pair of antennas.
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