If the aircraft are circling.... they can see you without dar.
except when that circling guy flys out of line of sight (low) and then comes racing back in when he see you on the runway (proxi-dar), watched a N1K1 do that the other day, got three guys that way, he knew they were their but they didn't know he was till they spawned in to die. Radar should not detect DEFINED ENEMY ground objects unless its ground based. They didn't have LDSD in WWII