Between your device and the bridge, and the bridge and your props, the line-of-sight range is up to 200 meters in perfect conditions. More realistically, it is similar to bluetooth - about 30 feet. It can be less if materials are blocking it, or if there are powerful RF devices on its frequency, like wifi, lots of bluetooth devices, etc.
For a show, the bridge should be placed on the stage very close to the performers for reliable use in a typical RF-noisy stage environment. Even if you test it on your stage with no audience, be prepared for all the audience’s mobile devices and other stage equipment to reduce the range at showtime.