Hello Dirk
this site covers the defence of Antwerp - but might give you guidance for your own project
http://www.skylighters.org/buzzbombs/
Frans van Humbeek, whose name and e-mail address appears in the text lives near to Grimbergen and might be able to assist you further. He has given me a lot of background information about B.60 Grimbergen, where my father arrived on the afternoon of 4 September 1944. It had only been liberated that morning.
cheers
Allan