Skylark B is the name of an espionage radio transmitter that was operated by students in Trondheim during the German occupation of Norway. Their station, called Sealion, was one of two radio stations that maintained the radio communication between Norway and the UK Secret Intelligence Service in the periode from January to September 1941. The transmitter does not longer exist, but there is a memorial plaque on the premises from where the transmissions took place. Follow the trail and sign from Gamle Bynesvei. If it's hard to find the location. Go upwards from a small stream. The steeper trail is probably the right one.
The memorial plaque contains names of the men who took part in the operations.
Follow sign from Gamle Bynesvei (by Klefstadmyra).