There are 0 pins on this high power RF circuit board.The Evaluation board type is Amplifier.Try searching with HMC454 to find RF Board variants.The mount is attached to PCB.
107749-HMC454ST89 Features
0 pins Amplifier Type
107749-HMC454ST89 Applications
There are a lot of Analog Devices Inc. 107749-HMC454ST89 RF Boards applications.