The AdMob page states the following "Smart Banner" Sizes.
Three ad heights (in density-independent pixels [dp]) are implemented in smart banners:
Ad height Screen height
32dp ≤400dp
50dp > 400dp and ≤ 720dp
90dp > 720dp
It isn't clear what that means for the various iOS devices in various orientations. I am looking at converting from iAd at the moment and am faced with resizing from the iAD 66 pixel high banner, but it isn't clear whether I am going to lose or gain space.
I see the ad height is defined in "dp"s based on the screen height "dp"s, but I am not really sure what this means.