Thanks! Can you use two of them in the same room?
These things are digitally coded and also select or hop around frequencies to allow more than one to be on the air at the same time. I don't know about this system specifically, but there have been some tests that indicate that significant problems occur at rc flying fields with some brands when 40 or more are in use at the same time.
This style of radio is also used in indoor flying contests and demonstrations where there are often a dozen or more planes in the air in a space the size of a basketball court.
Your robot application may have you in an even smaller room, so receiver overload is a possibility. You can always kill the antenna gain if it turns out to be a problem when you actually try it.