Our model is the "91XG", the SKU is "UE-MX91" which is the manufacturing facility's designation. The Internet Wayback machine shows that in Dec of '03, it was called the 91XG on our website.
https://web.archive.org/web/20031220...geAntennas.htm
Confused yet? Like I said, the instructions have never been updated since the antenna was added to our line several years before I started here.