Anritsu / Network Analyzer / MS46121A/006 
The MS46121A is a series of two PC-controlled 1-Port USB ShockLine Vector Network Analyzers with frequency ranges of 40 MHz to 4 GHz and 150 kHz to 6 GHz. The MS46121A provides performance and accuracy for your 1 port measurements in a low cost and space saving solution that is small enough to directly connect to the device under test.