Stetner is the founder and owner of the Central European Sports TV channel GP1 (TV channel). GP1 first started in 2011. under the name Kreator F1 and Kreator F1 HD for broadcasting only Formula 1 in the biggest Croatian provider Max TV - part of Croatian Telecom as Stetner acquired exclusive Formula 1 media rights for Croatia. Kreator F1 was renamed Kreator TV in 2013. In the following years GP1 acquired MotoGP, Volvo Ocean Race and other media rights and started investing in own broadcast facilities in Jastrebarsko, Croatia. Today GP1 is present in all major IPTV & cable operators in Croatia, Bosnia & Herzegovina and from April 2021. in Slovenia with the program on Slovenian language along with the motorsport and F1 news portals in Central-Eastern Europe. GP1 made a long-term deals with NASCAR Whelen Euro Series and some other European racing series like ESET Cup Series and it is producing live broadcasts from some of the most famous racing tracks like Hungaroring, Brands Hatch, Valencia, Slovakia Ring, Automotodrom Brno and others. Stetner is still at the helm as company's CEO.
