The first U-boats were equipped with FMG-41g Seetakt radar from 1941. All Type IXC U-boats were fitted with this set, as well as U-boats U-156, 157, and 158. The conning tower fixed antenna array was then replaced with a rotating retractable mast antenna from 1942.
In late 1942, all U-boats were built with the improved FMG-42g.
And finally, the new FuMO-65 was fitted on some of the Type XXI U-boats.
All these were in addition to the various radar warning receivers fitted during the course of the war.
I erred in saying they “were never fitted.” I should have said that operationally useful sets were never utilized on a wide basis.
According to uboat.net, the FMG 41g was “generally unsuccessful” and only fitted to the IXC boats, not the far more numerous type VII’s.
http://www.uboat.net/technical/radar.htm
At the same link, the FMG 42 was easily disabled by depth charges and commanders did not like to use it. It was fitted in late 1942 and that was far too late.
The Type 21 boats arrived far, far too late to influence the war.
About all the warning receivers told you is that a B-24 or Hudson was about to swoop down from the night sky and bomb or depth charge you.
Undoubtedly, Huff/Duff, SONAR, Bletchley Park, and sheer numbers all helped defeat the Uboats, but it is generally accepted by every serious historian I have ever read that the Allies made far better use of Radar than the Axis.
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