ADROIT was a project funded by DARPA's ACERT program to create collaborative teams of cognitive software radios.
ADROIT uses GNU Radio and has implemented an 802.11 receiver.

ADROIT also provided funding for development of m-blocks.

The 802.11 code may be found on the ACERT Collaboration Server within the adroitgrdevel project.
The CVS repository may be browsed.
See also hints for 802.11 usage.