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Marconi,

 

It's an Array Solutions AIM Antenna Analyzer, either the 4170 or the UHF model.  Cannot tell since the header has been stripped from view.  There are tabs at the bottom: one is called LIMIT, and that is where you set the bandwidth measurement limits.  Going to setup menu at the top, and that's where you select what parameter (graph) you would like to display.  This display is showing almost all parameters:  It looks confusing, but if you know what you're looking for you can see the forest for the trees.