i still pick up allot of telephone convo on my scanner. Most of it's on the lower frequency 15-50hz with 2ghz and 3ghz phones available it makes it very expensive to want to listen to the same boring convo i hear. Police activity is allot more intersting. Is there one thing particular that you're trying to target? Victim??
You need to know what type of phone that they are using. If you see them on the phone outside the house pay attention to the phone. if it looks newer its harder if its older it shouldn't be a problem. start with the low frequncied. i listen to my neighbors convos all the time. Sometime its some interesting stuff, sex,dating,drugs,church, all types os stuff
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the best defense is an unbelivable offense