A wireless outdoor-indoor multiple-input multiple-output MIMO communications system for communicating with user equipment located inside a physical structure, comprising: - a node adapted for wireless MIMO communication, having at least two node antennas, wherein said node is further configured for line of sight LOS wireless MIMO communication over a first radio channel with at least two outdoor-indoor repeaters (103,105,107); and - at least two outdoor-indoor repeaters (103,105,107) adapted for LOS MIMO communication with said node over said first radio channel, wherein said repeaters (103,105,107) having at least one repeater antenna (104,106,107) each, provided outside said physical structure, for outdoor LOS MIMO communication with said node, wherein said repeaters are each connected to at least one leaky cable, provided inside said physical structure, for indoor MIMO communication over a second radio channel with said user equipment located in an interior space inside said physical structure, characterized in that - said repeaters (103,105,107) are provided outside on the same physical structure and spaced well-apart such that the first radio channel between the node and the repeaters (103,105,107) support a rank that is equal to the number of repeater antennas (104,106,108), - wherein the number of leaky cables of each repeater (103,105,107) is the same as the number of repeater antennas (104,106,108) of each repeater (103,105,107), - wherein a first and a second repeater share at least one leaky cable, and wherein said first repeater feeds said shared at least one leaky cable at one end and said second repeater feed said shared at least one leaky cable at the other end, wherein - said at least one leaky cable is provided such that essentially the same indoor coverage of the same interior space in said physical structure is provided from each repeater (103,105,107), and - said at least one leaky cable is provided such that said second radio channel between the repeaters (103,105,107) and user equipment located inside said physical structure support a rank that is equal to the number of repeater antennas (104,106,108), - a node adapted for wireless MIMO communication, having at least two node antennas, wherein said node is further configured for line of sight LOS wireless MIMO communication over a first radio channel with at least two outdoor-indoor repeaters (103,105,107); and - at least two outdoor-indoor repeaters (103,105,107) adapted for LOS MIMO communication with said node over said first radio channel, wherein said repeaters (103,105,107) having at least one repeater antenna (104,106,107) each, provided outside said physical structure, for outdoor LOS MIMO communication with said node, wherein said repeaters are each connected to at least one leaky cable, provided inside said physical structure, for indoor MIMO communication over a second radio channel with said user equipment located in an interior space inside said physical structure, - said repeaters (103,105,107) are provided outside on the same physical structure and spaced well-apart such that the first radio channel between the node and the repeaters (103,105,107) support a rank that is equal to the number of repeater antennas (104,106,108), - wherein the number of leaky cables of each repeater (103,105,107) is the same as the number of repeater antennas (104,106,108) of each repeater (103,105,107), - wherein a first and a second repeater share at least one leaky cable, and wherein said first repeater feeds said shared at least one leaky cable at one end and said second repeater feed said shared at least one leaky cable at the other end, wherein - said at least one leaky cable is provided such that essentially the same indoor coverage of the same interior space in said physical structure is provided from each repeater (103,105,107), and - said at least one leaky cable is provided such that said second radio channel between the repeaters (103,105,107) and user equipment located inside said physical structure support a rank that is equal to the number of repeater antennas (104,106,108),