A system 10 for providing communication services to user stations 14.1 to 14.n which are spaced on first and second opposed sides 16, 18 of an elongate corridor 12, comprises a first node 20 and a second node 22. The nodes drive respective radiation patterns comprising at least first, second, third and fourth lobes 30, 32, 34 and 36 having respective main axes 38, 40, 42 and 44. The arrangement is such that in respect of the second corridor node: main axis 38 is directed towards a first region 14.27 which is on the first side 16, to illuminate stations on the first side; main axis 40 is directed towards a second region 14.46 which is on the second side 18, to illuminate stations on the second side; main axis 42 is directed towards a third region 14.10 which is on the first side, to illuminate stations on the first side; and main axis 44 is directed towards a fourth region 14.63, to illuminate stations on the second side.