The picture of the HUP is vaguely familiar, thought I’d seen it in the Australian War Memorial Archives
http://www.awm.gov.au/ but I have not founded it yet. But maybe some of radio types could narrow the search by identifying type of area and frequency range. For some reason I’m thinking that it is aircraft radio frequency.
Correct my memory not many HUPs in Australia, but definitely used by Australian Forces in other theaters of war.
Thought your photo was related to this one but no aerial
http://cas.awm.gov.au/item/SUK11997
Cheers Phil