This paper explores the potential of flexible antenna arrays (FAAs) in enhancing communication performance through dynamic adjustments of their surface shapes. FAAs, characterized by their rotatable, bendable, and foldable properties, are designed to achieve customized radiation patterns, particularly in multi-sector base stations (BSs). The authors develop a mathematical model to analyze how variations in antenna positions and orientations impact the wireless channel, focusing on multi-path channel power and channel angle Cramér-Rao bounds. They introduce three multi-sector BS schemes—separate flexible precoding (SFP), joint flexible precoding (JFP), and semi-joint flexible precoding (SJFP)—to optimize both precoding and flexible DoFs for maximizing multi-sector sum-rate. Numerical results demonstrate that the rotatable FAA achieves a 156% sum-rate improvement over a fixed planar array in JFP with directional patterns, while the bendable FAA shows superior performance in SFP and SJFP cases with omnidirectional patterns. The study highlights the significant potential of FAAs in improving communication performance through dynamic shape adjustments.This paper explores the potential of flexible antenna arrays (FAAs) in enhancing communication performance through dynamic adjustments of their surface shapes. FAAs, characterized by their rotatable, bendable, and foldable properties, are designed to achieve customized radiation patterns, particularly in multi-sector base stations (BSs). The authors develop a mathematical model to analyze how variations in antenna positions and orientations impact the wireless channel, focusing on multi-path channel power and channel angle Cramér-Rao bounds. They introduce three multi-sector BS schemes—separate flexible precoding (SFP), joint flexible precoding (JFP), and semi-joint flexible precoding (SJFP)—to optimize both precoding and flexible DoFs for maximizing multi-sector sum-rate. Numerical results demonstrate that the rotatable FAA achieves a 156% sum-rate improvement over a fixed planar array in JFP with directional patterns, while the bendable FAA shows superior performance in SFP and SJFP cases with omnidirectional patterns. The study highlights the significant potential of FAAs in improving communication performance through dynamic shape adjustments.