Those nets are rarely used if ever. as cellular phone access becomes more populous in the rural areas of california, the chiefs nets are used more and more infrequently. CDF command channels are frequently used for command staff opperations on large incidents and the Tac Nets are utilised by various branches and divisions of an incident. I know in SCU, CZU and TCU the chiefs utilize local net to talk to the ECC for routine traffic as the local nets have a fairly reliable repeater system.
if you want to monitor the Cheifs nets for those RARE chances that they utilize them, you are better off using a CB radio antenna for the 33mhz frequencies that the chiefs nets utilize. (this antenna also works great for the CHP's 42 mhz frequencies, but it doesnt perform too well for the 151 and 170 mhz frequencies that CDF and USFS utilize)
hope this helps