The Austrian mediatheque has just opened a new online exhibition devoted to women’s voices in honour of International Woman’s Day. Drawing on a large number of documents in Austrian archives, it explores a number of themes, from eras defined by the World Wars.
While drawing on Austrian archives, it is important to note that the exhibit and its voices are not at all limited to Austria. Eleanor Roosevelt, among many other famous women, is featured as well.
While the exhibition is not limited to radio, there is also a fascinating section devoted to radio voices: http://www.mediathek.at/frauenstimmen/nach-1945/radiostimmen/
The site is mostly in German, but an English description can be found at Europeana Sounds
alecbadenoch
carolynbirdsall
carolinemitchell2012
cvaldigem
gloriakhamkar
Heidi Svømmekjær
kterkan
nazanhaydari
Women's Radio in Europe Network (WREN) 
Even though I have been inhibited by my schoolgirl German it has been fascinating to read about, listen to and experience this archive. I particularly enjoyed trying to decipher the remarkable recording from 1890 of Florence Nightingale addressing the troops at Balaclava. For more about Heidi Grundman’s work , founder of the radio arts programme Kunstradio listen here- https://www.mixcloud.com/radioaktivitat/ (she starts in Italian and the rest is in English)