An apparatus (10) comprising a substrate (2) and an antenna (20). The antenna (20) comprising a first conductive element (21) having a first electrical length and connected to a first antenna terminal (31) and a second conductive element (22) having a second electrical length connected to a second antenna terminal (32), wherein at least the first conductive element is supported by a first portion of the substrate (11) and wherein at least the first portion of the substrate is configured to deform from a first configuration to a second configuration to: change the first electrical length of the first conductive element relative to the second electrical length of the second conductive element; and add or remove at least one operational resonant mode of the antenna.