![The shortwave radio signals that the alleged Russian spies were using are still surprisingly effective. The shortwave radio signals that the alleged Russian spies were using are still surprisingly effective.](http://www.slate.com/content/dam/slate/archive/2010/07/1_123125_2126996_2240593_2258796_2259604_100706_tech_antennatn.jpg.CROP.original-original.jpg)
The shortwave radio signals that the alleged Russian spies were using are still surprisingly effective.
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The mysterious world of 'numbers stations' and why we should care: Alan Cross - National | Globalnews.ca
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Is mysterious The Buzzer radio station MDZhB for Vladimir Putin's secret spy network? | Weird | News | Express.co.uk
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