The Dx radios don't interfere with each other.

In the days of 72mhz there was a pin for each "channel" and you had to have the pin for your channel or you didn't turn the radio on. 2.4GHz systems pick an open channel when they turn on and dont cause problems for other 2.4 radios and they are way above the 72mhz stuff in frequency so they wont bother those bands either.