Agilent HP 8753D /006/010/1D5/002 6 GHz Network Analyzer with 6 GHz Frequency Extension, High Stability Timebase, Time Domain, and harmonic measurement options.
Agilent Keysight N9923A FieldFox Handheld Vector Network Analyzer, 6 GHz. Includes Option 106, 112, 122. 6 GHz with full two port S-Parameters and Quickcal options.