Take this with a grain of salt, as I'm going from memory :
Metox was not really detected by allied aircraft. What happened is that the allies were, at the time, changing to another wave length for their radar, a wavelenght that Metox could not detect.
The british pilot was asked if they used Metox to home in on U-boat. He said yes, that the metox radiations could be detected for hundred of miles - He was BSing at a hundred miles an hour, and got lucky that the German believed him.
As far as I know, Metox wasn't used to home in on submarines. It just created a false sense of safety, that the allies, with their now-undetectable radar, capitalized upon.
But you might want to check some sources, just to be sure.
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