Fun antag gimmick ideas!

[Katzen]

Take over the radio station and set up electric chairs. Disable two to three victims (signal jammer good) and strap them into the chairs with radio triggers. Make them perform a quiz over the radio, shocking wrong answers, just make sure you shock the right channel.

This assumes the radio station power can actually handle chairs but at least they won't get vaporized on the first shock.
You may want an escape route such as hand tele and to block up the doorway.