All this "field upgrade" stuff is just a joke for me... In one of it's last interviews Zoltan Dani denied such modification and claims it's just a "marketing move" - a part of information war....
As we know, in Serbia SNR-125 first saw F-117 at the distance of around 18 km (9,7 NM).
According to this graph by Dr. Carlo Kopp...
SNR-125 at this distance can detect a target with RCS of about 0,0025 square meters... This figure well correlates with supposed F-117 RCS, so it may actually be true... Providing that all abovementioned figures are correct, of course.
