So what your saying is that the Germans would have to learn how to competently place spies into the UK to come close to figuring out that the nerve centers for the radar installations were all above ground? I kind of thought at one point that the Germans would have done better going after airfields and radar, but if it depends on their espionage capabilities I see no way for the Germans to change the outcome of the BoB. It is well known how absurdly successful the Allies were at completely dominating the espionage part of the war. Especially when it came to either capturing or silencing the entire spy ring in the UK, and turning it into what I think has to be the largest double-agent network in all of recorded history.
A spy network that hadn't been taken over by the British would help....
The Germans did knock out some stations, but either they were brought back online in a few hours, or false signals were broadcast. Giving the impression that even a successful raid (and remember, these raids cost planes) was only a minor nuisance to the British.
Hindsight shows us radar was important, but at the time it was all new and the Germans could only go on what seemed to be hapenning due to their efforts. It didnt help that the Germans didnt have their own equivalent of the system (it was the system that was teh really important thing, more so than the radars themselves), so had nothing to indicate what might happen when they knocked out things.