Embodiments of the invention may include packaged device that may be used for reducing cross-talk between neighboring antennas. In an embodiment the packaged device may comprise a first package substrate that is mounted to a printed circuit board (PCB). A plurality of first antennas may also be formed on the first package. Embodiments may also include a second package substrate that is mounted to the PCB, and the second package substrate may include a second plurality of antennas. According to an embodiment, the cross-talk between the first and second plurality of antennas is reduced by forming a guiding structure between the first and second packages. In an embodiment the guiding structure comprises a plurality of fins that define a plurality of pathways between the first antennas and the second antennas.