It's not especially useful in real life either.
The allies used high frequency radio traffic which was, for the Germans,
difficult to get a bearing on. Even if they did get a bearing, you in fact
get two bearings 180 degrees apart. Then you have no idea how far
away the signal is. Is it a weak signal just over the horizon or a strong
signal 1000 miles away? The Germans had no way to tell.
Even worse is the way the aerial must be manually rotated (It did not
rotate constantly). Most radio messages would finish before you could
even try to get a bearing.
The allied HuffDuff system was much better. It could get a good bearing
on high frequency transmissions and it often provided range data. The
aerial did not need to be rotated by the operator, so even short
messages could be detected instantly.
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