We are using something simalr that was used inthe Battle of Britan Scenario.
Nether side will have DOT Radar. There will be 3rd country radar sites sprinkled throught the LW side. The 3rd party controllers WILL have DOT Radar and they will have to VOX / TEXT what they see to the LW Command staff. It will be up to them to direct the LW Intercepters toward what they hope ar the bomber groups headed to the target.
Or something like that.