Shure Flag Extender

The WA653 Microphone Flag Kit provides broadcast professionals with the ability to expand the size of microphones to accommodate flags of varying sizes and shapes. Though the WA653 kit is compatible with all Shure interchangeable microphone cartridges, the most common applications include Axient Digital, Axient (AXT200) and UHF-R (UR2) transmitters. Multiple can be combined for greater lengths, but at a minimum, one WA653 unit will expand field microphones by up to 2.5 inches.

https://www.shure.com/en-US/products/accessories/wa653?variant=WA653