A dual antenna device includes a first antenna of a first polarization, a second antenna of a second polarization, and a conducting wall. The assembly is configured for seating within the drainage aperture such a flow of matter that would otherwise enter the drainage aperture passes through the valve assembly prior to release into a wider drainage network. In a second embodiment, the radio receiver changes to a different radio station when a voice-only signal is detected, or when a music signal is detected.