I have a radio shack PRO-92 trunk scanner and I can get all of the Milwaukee TRS working fine...ie, south milwaukee, cudahy, oakcreek ect.. But I can't get the Greenfield TRS to work at all. I'm putting all 6 of the Greenfield frequencies in and all the police talkgroups in, but I get nothing, like I said Milwaukee works fine, but greenfield is a dud...Do I need a more up to date scanner? Or am I not doing something right?? If anyone could help explain that would be great.