As a life-long -- literally -- listener to scanners or other radio devices, I'll give you the life-long answer. It won't be what you want to hear, but it worked in my youth when Dad was teaching me what radios could do to further your intelligence and worked in journalism, free-lance reporting and corportate communications after that. Don't buy more gagets. Train your head. I have at least three scanners going 24/4 in a fly-over part of the world even now, at the age of 88. I don't expect technology to make up for what your head can do. I know, even when asleep, that if it is interesting, there will be more chatter on some un-cloaked frequency. And if it is really a big deal, you will hear the stress in the voices talking or trading orders or responses. Use your head. Few do any more, but that's where your filter is. It led me to a lot of leads on other reporters or questions to ask of sources for a life-time. You might invest in some of that now, if you're up to it. Use your head, not your pocketbook. It really doesn't hurt even though it is unpopular these days.
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