With any question of wireless range, it's virtually impossible to give absolute answers. That's because wireless range can depend on a variety of factors. These include many kinds of interference, wireless bandwidth, and physical blockages of the signal.
With that said, after conducting various kinds of range tests, potential outdoor ranges of up to 300 feet (91.4 meters) are possible.
The SlingStudio Console app offers several different tools, such as the Dashboard, to help you evaluate wireless strength and quality.
Since there are so many variables for wireless strength and quality, the most useful approach is to set up your project's video sources, and then use the Console app's tools to determine the actual wireless range and strength levels that are happening with your setup.