In regards to the Opal Mtn site the first three frequencies are valid for that site under WPRY297 and the next two are also valid for that site under WQCM784. A more detailed search revealed two more frequencies are authorized for that site and they are 853.325 and 853.9875 under WQCM784. I am not in the Southern Nevada area at present so I cannot say if the control channels have changed to 853.325 and 853.9875. You might scan the two frequencies to see if there is activity on them. Note that all of the frequencies are also used on other NSRS sites in Clark County, Nevada.