HP / Agilent 3577A Network Analyzer, 5 Hz - 200 MHz, works great

LibreVNA 2.0 Upgraded 100kHz-6GHz Vector Network Analyzer USB Based 2-Port VNA

LibreVNA 100kHz-6GHz 2-Port Vector Network Analyzer with Flanged Connectors

LibreVNA 2.0 Upgraded 100kHz-6GHz Vector Network Analyzer USB Based 2-Port VNA

HP 8753C 300kHz-3GHz Vector Network Analyzer w/ 85046A Test Set

AGILENT E5061A NETWORK ANALYZER 300 KHZ-1 5 GHZ OP 016 275 M7576

SV4401A 50KHz-4.4GHz VNA Vector Network Analyzer 100DB Dynamic 7 Inch Touch LCD

HP Agilent 8753B Network Analyzer & 85046A S-Parameter Test Set 300kHz - 3.0GHz