So I have some money saved up for flashes ($350 U.S.). I also want to be able to trigger them via a radio trigger. I've been looking at Vivitar 285HV's and Sunpak  PZ42X.  But the problem is that I cannot find any way to trigger them  off camera.

I want to use them to shoot concerts (rock / punk / metal), so I need something sturdy and non-optical based for the trigger. I do not want other people's flashes making mine go off.  Does anyone have ideas?

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