I'm thinking of building a 4x4 MIMO antenna for a
Quectel EM160R-GL modem, for fun and experimentation. Can anyone suggest me a good resource on designing 4x4 MIMO antennas? One approach I had in mind is using
Batwing antennas in 4x4 arrangement, basically a two pairs of Batwing antennas mounted 45 degrees and mirroring each other. Would this be a sensible start?