Radar is it really worth it?

[GAGA Extrem]

It is said it improves your interception, but I cant confirm that.
However, the effect is quite nice if you ahve to defend a single province against air units.
Even on tier I, each radar level gives -2,5% to the enemy, so thats a -25% max in 1937!
Later on, you can easily reach -100% for the enemy - so he will propably never every try to attack your radarcovered provinces again

Useful for ENG, FRA and maybe SOV (to hold major cities).

Also useful at the pacific isles, where enemy bombers can be a pain for your ships and defending troops

 

[GAGA Extrem]

I can confirm it. If you pause the game and view the in-battle statistics of an interception over your own radar coverage you can see the radar modifier is indeed improving your own forces' effectiveness. At later radar techs this modifier serves as a force multiplier and enables you to use smaller interception groups, thus spreading the same force to cover a larger area of your hopefully much expanded territory.

Actually i was tealking about the rumors, that radar improves th ai logic of your airplanes, making them more likely to fly into provinces were enemy planes are approaching/inside...

 

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No, you do not see any units. The fog of war is "lifted", but the units moving through the province are still hidden. So actually there IS still a fog of war, though it looks like you would have vision...

 

[GAGA Extrem]

It just looks like the FOW is gone. The area is no longer darkend. But thats all. You do not see any units. The enlightment is just a visual effect, nothing else.