CISPR publication 16 describes a simple test procedure for assessing the suitability of a site for the making of RFI measurements. The paper describes an improved test procedure which also enables those features of a site which are detrimental to its satisfactory performance to be identified positively. The new procedure has been utilised to assess the site for the proposed free-field EMI test range at IBM Hursley Park, and some results from this assessment are included.