they are using a FSK signal on licence free 434.075Mhz in 70cm Amateur radio band, but you can't put an Amateur transmitter in one. not sure why we are limited in this way?
could you hang a becone or video transmitter under a tethered baloon or kite as http://ukhas.org.uk/communication:licence_exempt states
can be used?lots of cool stuff and you can view live on google maps at http://spacenear.us/tracker/
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