Castanet 5G Broadcast Internet - Where Audience Growth Multiplies Value — Not Costs Castanet’s 5G Broadcast Internet is built for live streaming and video on demand at a scale the unicast internet cannot match. Content is delivered once, directly to the device, in consistent quality at any audience size, at stable cost. No SIM card. No data caps. No last-mile tax that rises with every extra viewer. Infrastructure is only half of the model. The other half is the Castanet engag