In that big folder is a list of the permitted frequencies, bandwidth and power levels or wireless equipment that doesn’t need a full scale license (it sometimes needs a basic one).
This is the kind of equipment your laptop might use, as well as more powerful stuff used to send data to and from industrial machinery where its not feaisble or safe to run a communications cable to it (i.e the whole lot is in the middle of the North Sea). I expect the dude who bult the flying animals has been told to read the same thing by Agentschap Telecom when setting up equipment for his day job.
The CEPT document (with the 4 post horns, each with a lightning flash for electricity and a cross section of multi-pair cable in the centre) is 97 pages long, produced in Denmark from a meeting where all the boffins from the EU’s Communications Ministries sat round a table in in Tromsø (in Norway, perhaps the usual one in København wasn’t big enough) and describes in great detail what you can and can’t do with these European shared frequencies.
There is everything in there from hearing aid transmitters, wireless microphones, TV camera links to satellites that can communicate to space or bounce signals from the Moon. 3 sets of frequencies are clearly defined as “for extended range use of larger model aircraft” – into which category the ostrich fits 😉
