Starting April 28, České Radiokomunikace (CRa) adds a unique Ultra High Definition (4K) content to the experimental terrestrial [email protected] broadcasting in Prague. The content is provided by SPI International under the brand ‘FUNBOX 4K’. The test transmission from the Prague TV Tower on channel 50 reaches 17 percent of the Czech population.  The test broadcasting is aimed to verify multiple transmission parameters utilized during transition from DVB-T to the new 4K standard.