Question about Yamaha R-S202dab

I bought the device for my parents. Both via the cable (it obviously cannot receive DAB+ cable) but unfortunately also via the DAB antenna only about 10-15 stations are received (srf1 div kantone, srf2,3,virus and a few others). I reset the init scan and did it again. In the tune aid you can select bands (?)... what do I have to set so that all dab+ stations (e.g. virgin radio etc.) are found? Parents live in the Emmental... Thank you!