If you look at the .pdf document that you listed, it shows an item called AP-ANT-1B/1F, showing a quantity of 2. This is what I ordered, and the antennas came two to a package. I ordered two of this part number for each iAP-104. When the antennas arrived they also had the same part number on the package as I recall (I can't verify because I'm not currently at the site).
What is the antenna type that I actually received when I ordered that part number? I assumed by the part number that I would receive one of each type of antenna (one of the 1B, and one of the 1F). If that assumption is incorrect on my part, I would hope that you would update your documentation to make it more clear as to what the part numbers contain and recommended configuration should be.
I ordered the product in this manner because I originally visited your website and used the "get a quote" functionality to get started.