[JHSmentor]

one way of looking at the interference factor is that it forces the teams to be cooperative. The robocoach area will only have members of your direct alliance. this will require some coordination from these members to make sure only one transmits at a time. Eliminating the noise from the other alliance is easy enough by having a directional cone pointed only at the robocoach area.

of course, without a turret to point the cone, this will only work up to the first turn in the course - by then, maybe it does not matter.

other than that, I have not seen any discussion in other threads of a more robust solution. Of course, this does not take into account other types of communication (light and sound).