This AirMagnet (a Fluke company) brochure explains the technical options for wireless data transmission using 802.11 radios. The IEEE 802.11 standard specifies multiple transmitter antennas and multiple receiver antennas. MxN refers to M transmit antennas and N receive antennas. The standard allows various signal configurations where the multiple transmitters can add signal redundancy or can aim the signal. Also, a variety of coding schemes is allowed that trade-off signal bandwidth, noise immunity, and data transfer rate ranging from 7-600 Mbps. Co-existence with older versions of Wi-Fi is discussed.