I am hung up on this item. The New Zealand 486th squadron lost 17 Tempest planes and 3 pilots in these blasts. The Germans fighters and anti-aircraft guns had a much lower success rate against Allied bombers. The Germans gunners only had to set the fuses to explode at the altitude of the stream and shoot up into the 'stream', and their success was very limited. German officials recognized the ineffectiveness, but kept up the attempt to cheer up the German civilians.
Life takes strange turns.
His previous citizenship had been German. The number of large anti-aircraft guns used to defend German cites against Allied bombers is quoted as 18,000. Comments from Jerry L Brewer who did U.S. 90 mm AAA in Japan during the Korean police action. One final thought on AA guns against modern aircraft. Mr. Mullers book contains details on German AA guns and fire control systems.