Interesting! A conspiracy theory of mine is that one factor in the push to digital TV and radio was to prevent widespread pirate transmissions, as much more people got access to "studio" equipment aka multimedia devices. Of course if that was one motivation it is moot now, since the internet has become more relevant than traditional media.

Still, this might be cool for subversive actions in countries with censored media, in an "Arab spring" like situation. Just a laptop, SDR and antenna on a driving truck and your on air (ofc I think there is not much overlap in places with widespread digital radio and places where you'd need to do this anyway)

SDR has completely changed the landscape. I'm the developer for the digital television component of GNU Radio. There are transmitters for ATSC, DVB-T, DVB-T2, DVB-S, DVB-S2 and cable QAM. Here's a video of DVB-S2 being transmitted with a LimeSDR.

https://www.youtube.com/watch?v=Ed7iy0gVywo

Thank you! I'm happy to be corrected. :-)