Sygnały was published in the tabloid format, similar to the New York Times at about 56x40 cm (22x16 inches).

Among the literary contributors from Poland figured Erwin Axer, Maria Dąbrowska, Jan Kasprowicz, Stanisław Jerzy Lec, Bruno Schulz, Leopold Staff, Julian Tuwim, Debora Vogel and Józef Wittlin.

International literary contributors included Henri Barbusse, André Malraux, Carl von Ossietzky, Bertrand Russell, Upton Sinclair and Paul Valéry.

The magazine featured reproductions of art work by Alexander Archipenko, Jan Cybis, Xawery Dunikowski, Max Ernst, Henryk Gotlib, Bronisław Linke, Maria Jarema, Bruno Schulz, Henryk Streng and Zygmunt Waliszewski; avant-garde photographs and photomontages by Otto Hahn, Jerzy Janisch, Margit Sielska and Mieczysław Szczuka; and caricatures by K. Baraniecki, F. Kleinmann, Eryk Lipiński and Franciszek Parecki.

In 1938 an armed ONR (National Radical Camp) gang raided the editorial office and Karol Kuryluk barely escaped alive.