This diagram represents the organisation of a number of Luftwaffe Very High Frequency (VHF) Direction-Finding (DF) base lines that were created by the Luftwaffe, and in place before D-Day. DF baselines are imaginary lines or axis in which DF equipment of a DF network is deployed in locations on that line. Luftwaffe Signals used straight DF lines. The length of the base line indicated the net location capability value in miles, in which a DF location can be made. For example, the distance from Husum, Germany to Brest France is 716 miles, meaning that the net location capability is 716 miles in depth. IF-181 Seabourne Report Vol VI PT 1.pdf
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This file was derived from: Luftwaffe signals organisation in the west, middle of 1942.svg
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https://docs.google.com/file/d/0B7sNVKDp-yiJVnVaMWV1QkpldTQInformation from:

Scope creep
Goran tek-en, following request by Scope creep