Chalenge, do you know about the 'battle' the RAF had during the 'phoney war'? I can't for the life of me remember what the name they gave it was to look it up.
Basically, in the early days of the CH radar, it would detect aircraft along beams away from the radar masts. Unbeknownst to the radar operators, the radar would show a target along a straight line looking towards the channel, or back into Britain.
IIRC it went like this: One morning a squadron of Spitfires were upping for a patrol, this was detected on the radar screens due to the above flaw, and seen as an incoming German raid. So more aircraft were scrambled. The radar operators and control rooms thought the Germans were forming for a huge raid, so more RAF aircraft were scrambled. This process repeated itself until nearly every available fighter the RAF had were up in the sky looking for a huge 'German' formation, when really the only aircraft in the sky were themselves!
The flaw was immediately fixed in time for the real battle. I have it in a book somewhere, i will try and find it later.
Also, experienced AI radar operators of the intruder squadrons could tell a German nightfighter from the bombers in the bomber streams by looking at the 'blip'. Mossies or Beaufighters would accompany the bomber stream and try to intercept the fighters as they went in for the attack.
I haven't been following this thread, but I have read an account of this. The radar was on the shoreline aimed across the channel, but the radar worked in 2 directions (front and back) so it would report what was "behind" it as "in front" of it, so the more squadrons that were scrambled "behind" it and were heading to the giant raid, started showing up "in front" of it as part of the raid.
After the planes ran low on fuel and started landing the signal diminished until it was nothing. They discovered the problem and put the now-everpresent screens behind the radar, so that it only reads the signal in one direction ("in front") now. I think there were a couple of friendly fire incidents during this "raid" as well.