There are 0 pins on this high power RF circuit board.The Evaluation board type is Attenuator.Try searching with HMC542 to find RF Board variants.The mount is attached to PCB.
114399-HMC542BLP4 Features
0 pins Attenuator Type
114399-HMC542BLP4 Applications
There are a lot of Analog Devices Inc. 114399-HMC542BLP4 RF Boards applications.