This station primarily transmitted pro-German programmes. For news from the Allied camp the Dutch secretly listened to the BBC and Radio Oranje, the Dutch government’s radio station in exile, transmitting from London. People hardly paid attention to the listening ban imposed by the Germans. The occupier tried to jam the reception of Radio Free Orange and the BBC.

This handy device, easily made at home, was used to listen to broadcasts from London with as little interference as possible. It was therefore referred to as a moffenzeef ('Kraut filter') or 'German filter' because it sifted out jamming signals.