Sorry Danny, the capola (capoli?) was/were a concreate room sunken into the ground at both ends of the runway. The only part of the structure at ground level was a hatch for the unfortunate occupant to open and climb down into and a glass capola big enough for one person to look outside to see if his world still existed - Cold War RAFG etc etc. As ground radio the bunker had to be fettled once a month but all it contained was some basic furniture and a couple of ARC52 UHF sets, there might even have been a CADF in one of them. Given the frequency of mini, maxi and tacivals Laarbruch enjoyed in the 70s I image ATC occupied them at similar intervals. I recall one being designated as Local and the other Approach but I can't remember if they swapped roles if the runway swapped directions, given only one had a CADF, IIRC, I'd imagine not but it was a long time ago.