ORIGINAL: ROGER RUSSELL
That is a concern no matter if I use a 72 channel or the 2.4.
It should be of very little concern on 2.4 GHz. If you are using the Spektrum radio, the Rx is bonded to the Tx by a 32 bit code word. The odds of colliding with a Tx using the same code word are exceedingly small, even if you are on the same pair of frequencies, also not very likely. Might better worry about colliding with an incoming meteor.
Abel