An on-body drug delivery device may have one or more antennas secured outside a housing of the on-body drug delivery device for facilitating wireless communications. The one or more antennas may be secured to an adhesive pad that adheres the on-body drug delivery device to a user. Alternatively, the one or more antennas may be secured to a portion of the housing for the on-body drug delivery device. In such instances, the one or more antennas may pass through one or more holes in the housing to facilitate an electrical connection with a component, like a wireless communications transceiver, inside the housing. Alternatively, wireless communications with the one or more antennas and the component may be used.