Bullpucky.
I've watched crews spend days painting operating broadcast antennas.
I've seen numerous instances of protesters climbing antennas of all manner of broadcasters, either to hang banners or to stage 'camp ins.'
Finally, our friends at Mythbusters tried the old 'cook you' myth with turkeys, and failed miserably. Besides broadcast towers, they tried radar masts.
I expect that the antenna in the video was operating at full power as they worked - and, contrary to the explanation in the video, I believe the spikey things you saw were there on account of broadcast static, rather than natural lightning.
