Agreed. Normally there would be a vertical antenna to handle the directional ambiguity of crossed loops like this one http://www.tcibr.com/PDFs/7235webs.pdf but I have seen some papers which did some very fancy signal processing to get the same result. I have also seen a paper about a df antenna using a square ferrite loop, mounted horizontally, with 2 or 4 windings and some electronics. All the signal processing has to happen in the box since it’s just a plain old cat 5 type cable output - right?
Does the cover come off?