I had a funny experience in Munich a few weeks ago.
I had a KX2, an electronic morse key, a coiled up dipole antenna and a 26Wh LiPo. I put everything in one of the plastic trays and passed security control without any problems.
I was already collecting my items from the tray when the passenger in line behind me asked me what I carry in my hand luggage. This drew the attention of security staff. They picked up the KX2 and showed it to a supervisor. It then got swapped and presumably tested for explosives. I wished eternal damnation (and some other things) to the stupid passenger, but it all went well. I got the radio back and overall it did not cost me more than a few minutes.