Actually, The Colony Fire department hasn't gone over to UHF yet, they are still on the Denton County trunking system for their operations.
This is due to the mutual-aid requirements. (all the mutual-aid departments are on 800)
The toneout is repeated on their trunking talkgroups, the main police frequency, and their VHF repeater.
If the toneout starts with a single long BEEEP it is a fire call, if it is a series of beeps it is a medical call.
The police are on UHF full-time now. The repeater has excellent coverage (I can hear it way down into Tarrant county and over into Wise county) Not sure what sort of equipment they are using (probably Moto though)
All of the info is available on the Denton County pages here on Radio Reference.
-brent-