Search the databse here for the Denton County Motorola trunked system. I'm not 100% certain, but I suspect Krum is covered by Denton County SO. They use this system for communication.
I looked for Krum, but did not find anything.
They might be part of one of the other TRSs in the area.
Krum FD should be on the Denton County System, they are listed there.
I can't find a listing for the PD.
I would assume that they (KPD) are on this system also. just not listed.
Maybe somebody that lives up there might know for sure though.