There is something like an antenna that works like an amplifier, repeating every signal in the device frequency operation range but wireless.
I mean that this "dumb" active antenna receive every protocol and retransmit all, and of course it need some power to do the job.
I know that specific devices can retransmit the signal using the same protocol (WI-FI repeaters) and also I'm aware of Wireless repeater that work connecting RF cable to the amplifier. Obviously this is not the most elegant solution but the environment that I'm working hasn't too much RF signals.
In short I'm searching for a 2.4 Wireless Repeater.