last I remember they used southerlink which you wont be able to monitor. All the ema directors had a southerlink radio so they could talk to gema. Its a cross between cell phone / radio push to talk.
There used to be a state wide 49 MHz radio they would use. Dont know the frequency anymore. It was for emergencies if and when everything else would be down.
GEMA scrapped VHF low years ago. Current fleet of Harris XL-200p's include cross programming on multiple trunked systems, the state's Harris VIDA core with BeOn, and the typical combo of NIFOG zones (e.g. V-TAC, U-TAC, 7/8 TAC, etc).