What periscope upgrades did they have? I thought they used the same scopes the whole war...
One note about the rod antenna for functional purposes: the rod antenna was a vhf type and only worked for short range, line-of-sight communications such as ship-to-ship; it was the jumping wires going fore and aft from the tower that provided long range comms, so I'm not sure the antenna rod was ever deployed while submerged...
Here's an old subsim post about the availability of the different models of radar and radar detectors (
http://www.subsim.com/radioroom//arc...p/t-94024.html).
The first application of Alberich occurred in 1940, but the faulty adhesive prevented further use until 1944. Not sure about tarnmatte...