The STO-0609300-T-E1 from ERAVANT is a Vector Network Analyzer Extender with Extended Frequency 110 to 170 GHz, Input Frequency 4.58 to 7.08 GHz, LO Frequency 4.58 to 7.08 GHz, Output Power -5 dBm (Test Port), Input Power -3 to 3 dBm (LO, RF). More details for STO-0609300-T-E1 can be seen below.