technology as I see it here is802.11b, Wi-Fi. A typical scenario is

All you need is 1. A few activists incl. a few to capture the content (eg, videographer, photographer) who are willing to carry a few extra pounds 2. Someone to pony up the equiptment (some of which must be treated as expendable) 3. Someone to set up & test the rig with the deployees. Depending on your circles, you may find each of these types in different abundances. The enabling the case

of public demonstrations where the local "authorities" are called in, and where they get, shall we say, a little overzealous. In many such cases

(here, New York City, Here, USA, and there--China, etc...), such authorities will attempt to confiscate devices that could have captured the events or captured the perpetrators (and their badge numbers, if applicable) in photo or video.