Agilent 8753C vector network analyzers:

Product Specs:

* 300 kHz to 3 GHz
* Superb accuracy, with the most comprehensive calibration available
* Optional time domain and swept harmonic measurements
* Mixer testing with frequency offset capability
* Optional step attenuator for extended source output power range
* Pass/fail testing, interpolative error correction, test sequencing, and user-defined test frequencies to enhance productivity
* Two independent display channels for simultaneous measurement of reflection and transmission characteristics

http://www.testequipmentconnection.com/products/3240