[@WrongEndoftheRainbow] Really good first post, even if its wrong in one small subject: Freedon radio would be galaxy wide, yes, but it would travel only at lightspeed. The rebellion would end before you get a message to nearby systems.

However, I adore your idea far too greatly, so I'll say that your nearby surroundings in a few hundred lightyear distance can hear you. Which means that you should put yourself on the map that we have ( somewhere :P )