Actually Germans achieved to have bombers 15 km outside of New York unseen and ready to strike but Hitler cancelled the whole operation. I can't find the source I read this for more detail.
That's how we measure them here, but I think in the States they go with the 14", 18"...format. It's just how it's measured. 14" would be the actual viewing area, where 15" would be the width of the entire monitor.