Interesting stuff. If I remember correctly I believe that some U.S. subs did start to receive directional air search radars, but it wasn't until late in the war (late 44?).
I also read something else interesting about U.S. search radar. It's common knowledge that most submarines rarely used their SD radar during the war because they thought that the Japanese could detect it and immediately locate the sub. The reason they believed this was because whenever the set was turned on Japanese aircraft usually showed up in a relatively short time. It appeared that the radar was attracting enemy planes when actually the planes where there all of the time but where to far away to be spotted visually.
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