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Yes, of course. Any suggestions on SDR-based hardware/software options?

Broadcast meaning unidirectional, with support multiple receivers, and no association or acknowledgements required.

Correct me if I'm wrong, but I don't believe there is a "broadcast mode" for wifi.

So I'm asking if there is some SDR software/hardware combo that works well for this purpose, or if re-purposing wifi is the best option.

I want to broadcast (unidirectional) UDP packets over the air on 2.4 GHz or 5 GHz at 3+ Mbit/s at maximum (legal) power. Is there a good way to do this with any current SDR hardware? Or is my best bet to ab(use) wifi cards for this purpose?