Are you not familiar with military HFDF equipments and facilities? CDAA elephant cages?
The internet says there are no more of the great HFDF systems in use by the US Navy. FRD-10 is dead.
I"m wondering if they replaced them with something better...or just abandoned the concept as HF faded from military comms?
Are you not familiar with military HFDF equipments and facilities? CDAA elephant cages?Yes; need you ask? (You haven't been able to deduce I'm a student as well as practitioner of this 'art'?)
The question/the subject you have to be concerned with is: "What are the accuracy limits" of these and other HF DF systems at-distance (Wullenweber or "Circularly Disposed Antenna Array -CDAA- arrays don't exist every 250 km apart in a 'grid' across America, not yet anyway). Again, I have to come back the issue of 'ambiguity of bearing' due to HF propagation characteristics (skywave-groundwave interference effects; are you unaware of these effects?).
Isolating a lone operator in a residential area with a bearing (or two bearings) at distance is going to give you a circle or 'ellipse' miles across to search with and again I have to come back and underscore the fact that you are going to be in search of uncooperative sources (literally: sources transmitting _not_ in a predetermined, deterministic manner like a Yosemite Sam) who are most likely using wire dipoles (which can be made hidden from the street) making visual ident from the street practically impossible ... couple that with the fact these 'rabbits' have eyes and ears and could hear air assets miles away ... I say 'good luck' to those wishing to 'score' the source in an afternoon; they are going to need it.