Day one antenna has normal gain at first glance but has strange beam pattern and no elevation beam pattern. So, I think that it did not worked as antenna in Ogasawara...
Workable antenna's pattern is next picture. The patterns are very beautiful but antenna height was not enough (about 3mH) and had its the first lobe is 7.5 degrees. By another simulation at 5mH, it is 2.3 degrees... If you need the configration file, you can get it from click the picture.
Note: the length of each elements was provided by the manufacturer. the positions calculated the absolute size from the drawing. SWR and jx was not under consideration.