As we are gearing up for our test with the 450i I am curious about the SM and if you must use an external yagi antenna? If the SM has direct LOS with the AP does it have an internal antenna that can suffice? Do I need to test with the yagi plugged in to keep from damaging the radio?
Thank you for the link, I've been following most of those guidelines, just fired everything up for the first time and got a connection. As I configure it more I will have the  frequency turned to none.
The AP and SM's use external antennas. There are no models with integrated patch antennas. There are some patch antennas for 900MHz, but they're big and expensive.