A method of improving a performance of a cellular network, said cellular network comprising a small cell base station providing radio coverage within a small cell, said small cell base station comprising at least one antenna operable to provide radio coverage in one of a plurality of antenna patterns, said method comprising: an exploration stage comprising measuring at least one indication of a performance of said small cell for at least some of said plurality of antenna patterns, said indication of said performance of said small cell comprises at least one of: traffic offload, and user equipment mobility; wherein measuring traffic offload for each of said at least some of said plurality of antenna patterns is performed by periodically switching between said at least some of said plurality of antenna patterns and determining for each of said antenna patterns at least one of: (i) the proportion of time during which said antenna pattern was selected that said small cell was active; and (ii) at least one of uplink and downlink normalised traffic volume for each of said antenna patterns; and wherein determining said mobility of user equipment is performed by determining a number of transient sessions, in which a timing between an inbound and outbound handover request for a user equipment is less than a predetermined time, for each of said at least some of said plurality of antenna patterns; and an exploitation stage comprising selecting one of said plurality of antenna patterns in dependence on said measured at least one indication of small cell performance and providing said small cell radio coverage using said at least one antenna configured to generate said selected antenna pattern, wherein said cellular network comprises a macrocell base station providing radio coverage within a macrocell, said small cell lying within said macrocell. an exploration stage comprising measuring at least one indication of a performance of said small cell for at least some of said plurality of antenna patterns, said indication of said performance of said small cell comprises at least one of: traffic offload, and user equipment mobility; wherein measuring traffic offload for each of said at least some of said plurality of antenna patterns is performed by periodically switching between said at least some of said plurality of antenna patterns and determining for each of said antenna patterns at least one of: (i) the proportion of time during which said antenna pattern was selected that said small cell was active; and (ii) at least one of uplink and downlink normalised traffic volume for each of said antenna patterns; and wherein determining said mobility of user equipment is performed by determining a number of transient sessions, in which a timing between an inbound and outbound handover request for a user equipment is less than a predetermined time, for each of said at least some of said plurality of antenna patterns; wherein measuring traffic offload for each of said at least some of said plurality of antenna patterns is performed by periodically switching between said at least some of said plurality of antenna patterns and determining for each of said antenna patterns at least one of: (i) the proportion of time during which said antenna pattern was selected that said small cell was active; and (ii) at least one of uplink and downlink normalised traffic volume for each of said antenna patterns; and wherein determining said mobility of user equipment is performed by determining a number of transient sessions, in which a timing between an inbound and outbound handover request for a user equipment is less than a predetermined time, for each of said at least some of said plurality of antenna patterns; and an exploitation stage comprising selecting one of said plurality of antenna patterns in dependence on said measured at least one indication of small cell performance and providing said small cell radio coverage using said at least one antenna configured to generate said selected antenna pattern, wherein said cellular network comprises a macrocell base station providing radio coverage within a macrocell, said small cell lying within said macrocell.