Would you absolutely need wireless? I understand why you would, if the venue you're using isn't your own.
I would reccomend the Netgear ARLO system. Good price for the quality you're getting. It uses an existing WiFi network, so as long as a wifi signal can reach the stage managers then it'll work just fine. I'll link to them here
If calling cues,a second would usually be unacceptable IMHO.
Why wireless?
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