'A new direction finder working on this band was eventually produced, known as CADF (commutated aerial D/F). A brick building with a 20ft diameter metal mesh disc on its roof appeared on all airfields.'
The building described there is DRDF (certainly to the RAF), which still appears on some RAF stations.
I'm 100% convinced that the building in the original pic is a CRDF, possibly with a newer aerial. Positioning of lights on roof could be due to their fitting on actual antenna causing electrical and physical interference to it.
The red and white squares would also inferr the building was radio aids, and ad hoc brick buildings don't just appear on airfields.