Comment: Although I understand your

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In reply to comment: While I do like the idea, I (see in situ)

Although I understand your

Although I understand your objections, we don't necessarily need EVERYONE to possess a transmitter. Most people just need receivers and one other format for two-way communication, e.g. a telephone. Furthermore, I don't think mobile transmitters are out of the question although I see some obstacles to their deployment. Depending on the antenna, frequency, and environmental conditions, low-power DRM broadcasts can travel quite a distance. DRM broadcasts are VASTLY more energy efficient than analog AM broadcasts. Currently, I think the biggest obstacle is the availability of cheaper DRM transmitters and software, e.g. Spark. * Cheaper DRM transmitters are coming, though, and with it the high probability of the world's "first" DRM "pirate" broadcast. More later...

* http://www.drm-sender.de/