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The 10-10 International Net is a group of Amateur Radio operators who work mostly on 10 meters (28MHz). To join, you need to collect ten 10-10 numbers and submit an application. After that, you get your own 10-10 number.

One of the fun things to do is paperchasing. There are many small clubs that work with 10-10 and give out certificates for contacting and trading 10-10 numbers.

Visit them at http://www.ten-ten.org

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