Channel 836 161.2875 analogue: Mt. Macedon, Mt. Ida, One Tree Hill etc.
Channel 762 164.1375 P25: Pretty Sally, Mt. Despair, Mt. Hickey etc.
Channel 718 164.2625 P25: Mt. Franklin, Mt. Blackwood etc.
Ch. 718 is also used by DELWP ops & ICC and patched to another couple of channels, so these particular fire towers may or may not be on the channel - I don't know what other channel they use. They may use SMR.