The Hermes had Rebecca early on and I think these are the related antenna. This arrangement can be found on several British operated aircraft of the immediate post war period. Including Yorks, Tudors, Hastings and some BOAC Constellations. The Argonaut appears to have a similar set up to the original post, but I haven't found a good close up picture.
In Larry Milberry's excellent Wilf White propliner collection book there is a photograph of BOAC L749 G-ALAK that also appears to have the nose mounted antenna.
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HP81-Rebecca by [url=https://www.flickr.com/photos/60717421@N06/][/IMG]