Can anyone recommend some basic equipment to "troubleshoot" radiated emissions failures? Or to "predict" possible sources prior to testing?

spectrum analyzer?
old rabbit ear/bowtie antennas?
e/h field probes?
CM current probes?

On a 48VDC product I had a failure in the 36 to 47Mhz range that was solved by a simple addition of clamp on reffites but just want to see if I can move past the band-aid fix and find the source.

 

Small diameter (~ 1" or less) loop antennae that connect to the spec an. to help zero in on radiators

Can probaly make some yourself, check google.