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My 20mW is only visible in air from up to about 20m away. That basically makes it visible from my neighbour's yard and no farther, and they'll just ask what I'm up to if they spot it. I'm not too concerned about drawing unwelcome attention while using it, provided I pay attention to the departures flight path to the west of me and arrivals to the east.
On another note, customs has been opening all of my possibly laser-pointer sized torch shipments lately for inspection. They really do seem to be paying attention on this one.
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