TBS CROSSFIRE supports two different frequency bands which are 868mHz and 915mHz..
It operates on 868 MHz in ITU-1 (Europe), and on 915MHz (rest of the world). What are the frequency hopping channel range?
Crossfire operates in the entire ISM band of 868, so it spans between 850 - 870Mhz (868mHZ) and uses 902-927Mhz ( 915mHz)