Untill we have people to vector us real-time to incoming cons, dot dar is a necessity. The truth is, ground based radar did exist, and there were flight control officers who told the you where the cons were. Pilots in flight would also report any enemy activity. Untill someone is willing to vector us to enemy cons, while they sit in the tower... I vote for dot dar. BTW, radar also gave elvations, which we DO NOT have, so please be quite about this onboard radar and AWACS and such. HTC is merely providing us with the information WWII pilots had, maybe even less...