HDMI extenders can be used to connect your large spectator display to your scoreboard computer when typical long HDMI cables aren't long enough, such as when your distance is over 100 feet. They can typically extend the cable length to 300 feet or more. Many work by sending the HDMI signal over one or two ethernet cables, such as CAT5e or CAT6.
Example use: Connect your large spectator display to your scoreboard computer.