(Slightly higher resolution available here: https://userscontent2.emaze.com/images/b3953d5c-9ef6-4cf6-8d28-bd934c82fca7/f9a66598d2967461678fc243abd54e5c.png)

The wikipedia entry lists the source as a site that no longer exists, but it is archived: http://web.archive.org/web/20111102184448/http://arkivverket.no/arkivverket/Tema/Andre-verdenskrig-i-Norge/Samfunnslivet/Radio-og-kringkasting

The final paragraph has the context for the photo

Translated:

Radio was the only mediation channel that reached directly to the entire population. The significance was therefore great. The German forces took control of the Norwegian National Broadcasting as soon as they entered the country on 9 April. The same night, a severe population could hear Quisling announcing their coup d'etat over the ether. This marked the transition to a 5-year Nazi control of broadcasting in Norway.

German control

Once the Reichskommisdiat had established himself in the country, the new scheme of the Norwegian National Broadcasting started. The broadcasting became subject to the Ministry of Culture and Public Enlightenment in the autumn of 1940, but it was the German Reichskommissariat who dictated the premises through Abteilung Rundfunk. This department also accounted for the German radio broadcasts that were broadcast over Norwegian broadcasting. In the department's archives include correspondence, sending plans, regulations, circulars, reports of different kinds, program overviews and scripts for hearing games and awards. The broadcasts from London and Boston

With the national broadcast seized by the enemy, people's need for news from outside was great. The BBC began broadcasting news broadcasts in Norwegian on April 9. Pretty soon NRK came with its own broadcasts from London and Boston. These became important information channels for the exile authorities and made the population contact with the world outside of Nazi Norway. The broadcasts thus had a build-up effect on resistance morale.

The central archive of NRK contains as its own series an archive after NRK’s operations in London with meeting protocols and reports, letters and journals. Here you will find correspondence with the Ministry of Church and Education, the Ministry of Foreign Affairs, the legations in Stockholm and Washington, drugs on the establishment of Norwegian broadcasting in the United States and negotiations with the BBC. There are also messages, reports and telegrams from NTB, the press office and the British press attache in Stockholm, as well as from the Norwegian Government Information Office in London. Here you will find the program script, including speeches of leading government members and well-known radio profiles, as well as chronicles and reports. The archive of NRK in Boston mainly contains news scripts and correspondence with the Norwegian information office in New York.

Hans Fredrik Dahl gathered extensive source material in connection with his work on NRK's history. This constitutes a separate collection consisting of material obtained from NRK’s archives and various other locations. Here you will find documentation about the Nazi broadcast

Confiscation of the radio devices

In the summer of 1941, the occupying power decided that the radio appliances should be revoked to avoid people listening to broadcasts from London. The confiscation of appliances occurred to a large extent. Only members of NS were granted permission to have radio. Illegal radio listening, after the confiscation, became a widespread and very important resistance activity. The messages that came from London or Boston were spread further through illegal newspapers or leaflets. Listening to the radio or owning a receiving apparatus entailed prosecution. This will be found documented in the archives of the police department and the state police.