I am not sure if they use radios.

Do you know for sure that they do use radios for comms?

They may use cell phone push to talk equipment?

I did not see the freq listed on radioreference.

If you can confirm they use radios then the only way I know of to grab the freq is to use a scanner that has a "close call" or capture capability to grab the freq.

When do you think the comm traffic would be the heaviest?