BDF changed their Air to Air FM channels for 2017, listed above. I think some confusion here could also be what is happening on each channel during an initial attack of a fire, and then extended attack roughly 24-36 hours.
Initial Attack on a dispatch will have all aircraft coordinating on an Air-to-Air FM channel. The Air-to-Ground channel will be used for Air Attack to coordinate with the IC, and for helicopters to coordinate with ground troops on water drops. Both the AA and AG channels are preassigned by Forest, so everyone knows where to go on initial attack. Typically once there are plenty of fixed-wing over a fire, air attack will move the rotorcraft (copters) over to an AM "victor" frequency, leaving the FM channel to the fixed-wing tankers only. There are pre-assigned AM frequencies in CA as well for this, assigned by the air attack's zone of influence (for instance if Hemet-Ryan's air attack is primary on a fire, they'll use the victor assigned to Hemet.) For ANF/BDF fires the two AM freqs would be 136.000 and 135.575.
Now it all changes on extended attack.
They want to release those IA frequencies back for IA on new fires. It can be random where they move to, but "typically" move onto some overflow freqs of the old Air-Air freqs (170000, 166675, 167950, 169150 169200). Victor nets can be totally random in extended attack. A trick to find them is to see if an FAA TFR has been assigned to the fire (might take 24-36hrs for this), and if so, there is a frequency listed for TFR contact - that is usually the helicopter victor.
And it can all change again when a Team takes over a fire.