Pinball machines are complex machines with various electronic components. As those components age, they often emit harmless RF frequencies that can interfere with radios. For this reason, we strongly recommend placing the Scorbitron within the backbox and high up as possible. An antenna should not be necessary. The same is true with multiple machines, as each device is an independent network client of your WiFi access point. Your access point is the hub, and the Scorbitrons are the clients. In highly dense situations with many machines, such as a tournament or arcade, we recommend creating a separate, hidden WiFi SSID for the Scorbitrons to avoid network congestion and competition with your customers or staff, but it is not required for modern WiFi equipment. More information on these topics can be found in the Network Guide.