questnz - Close Call and Signal Stalker are a joke. get a Real NEAR FIELD receiver like the OPTO Digital Scout or just use a Laptop with SDR. the Opto Digital scout LOCKS on Instantly as soon as someone KEYS up. it can search its Entire Spectrum in Less than 1 second. and records Frequency, tones, data and how many times a Frequency is used. If you have a ICOM R20 you can React Tune the Radio. and R20 can use Voice Scan as well as Write to Memory Automatically. all Close call and Signal stalker are SEARCH BANKS, nothing more, they cant Analize the network. Opto Digital Scout is pager sized, can be SET to Vibrate, Beep or remain Completely Silent while operating. I frequently walk Malls and other Targets as well as park near Police Towers to capture frequencies.