The 10-10 International Net
is a group
of Amateur Radio operators
who work mostly on 10 meters
). 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