I suspect - but I may be wrong - that the brochure is written by the marketing department, and - strictly speaking - it is carefully worded to suggest something ( better than reality) without being technically incorrect (to the point that you can use that for suing them).
The brochure says :
Antenna beam 180 degrees
which may be not totally inaccurate, but they forget to mention that emissions in the outer 30-45 degrees on both sides are a fraction of those in central 90-120.