An implantable medical device ("IMD") configured in accordance with an example embodiment of the invention generally includes a housing, a connector header block coupled to the housing, and an optional telemetry antenna coupled to the header block. The optional antenna assembly is suitably configured to support the intended IMD application (e.g., the desired telemetry range, the intended IMD implant location, or other practical considerations). The optional antenna assembly may be utilized by itself or in cooperation with a permanent telemetry antenna of the IMD. In one practical embodiment, the optional antenna assembly has a connection end that is compliant with known pacemaker electrode lead standards, which allows the IMD to leverage existing connection methodologies.