What ieee 802.11 wireless standard supports devices only in the 5ghz range with speeds up to 4.9gb/s because of accepting data from multiple devices on multiple antennas simultaneously?

The answer is 802.11ac  

802.11ac is a type if IEEE 802.11 wireless standards that supports Multiple Input, Multiple Output antennas on sending and receiving data. This type of wireless connection supports 2.4GHz signal or frequency and data speed transfer up to 4.9Gbps. Each device or antenna can run up to 400Mbps each and the maximum device it can handle is up to 8 antennas.

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