In the most nicest way, but telling you the truth, if you want to monitor the cops/fire/ems/etc in Montgomery Co it should be the SDS 100 portable or SDS200 fixed base unit. The county system is new technology and no old technology scanner is gonna work. That said, much of your area is ENCRYPTED which means no scanner out there is going to let you hear the encrypted signals.
You could move away from hearing the cops/fire/etc and go with something to hear ham radio repeaters, weather channels, civilian/military aircraft/railroads and you've got choices. There might well be something reasonably priced on Fleabay or elsewhere that will work for that. An Uniden BC125AT would fill the bill for hearing the other stuff nicely.
The hobby is moving away from being to listen to the police/fire/ems in a hurry.
Hope this helps...