Through Hole is used for RF Transceiver' mounting.As a member of the XBee-PRO® DigiMesh 900 family of RF Transceiver Modules, this part is prominent in many specifications.
XBP09-DMSIT-500 Features
Through Hole
XBP09-DMSIT-500 Applications
There are a lot of Digi XBP09-DMSIT-500 RF Transceiver Modules applications.