Shure HA-8089 PWS Helical Antenna:

The HA-8089 is a high bandwidth helical antenna for use with wireless microphone systems and in-ear monitor systems. The HA-8089 greatly improves RF performance by distributing signal multi-dimensionally between 480 to 900MHz. The result is longer range without interference, high gain and the freedom of movement regardless of the antennas position. 

• Covers a bandwidth between 480 and 900MHz 
• RF energy rotates through 360 degrees of polarization 
• Crystal clear reception no matter where the artist moves on the stage

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