2.4ghz devices cannot generate and won't accept interference. They're smart, in that when they go online, they look for an open channel in the 2.4ghz band. If one isn't available, they stay offline till one opens up. That, in turn, means that a newly turned on one will never get on your channel. That's why 2.4ghz is the future.
Thats what my wireless 'wi-fi' router works on... wonder if there on like the same kinda new system... If so I can pick up signals from my router across the street and its down here in my basement. Thats got to be awsome for r/c!
-Wes