Thanks Nick, good idea.
And the Beacon Bible link I couldn't find at first is near the bottom of the page at
https://www.gyges.dk/Gebiets%20nachtjagd.htm for anyone who is interested.
I have also been looking at Chazette's book about EW facilities in Normandy and his larger 'Atlantikwall' volume, although they are not consistent with one another about the names and numbers of Y-Gerat (Benito) stations (presumably at some point the numbers were re-allocated as the network grew, and possibly some stations closed before Steinbock began). Also the RAF 80 (ECM) Wing History at AIR 41/46, which gives me a headache (serves me right for coming from a Humanities background when what I obviously need is some science degrees) but is still very helpful.
Just want to get the map right, or at least as right as possible!