A multi-purpose chimney cap device for a flue opening. The device includes a tubular housing with an open lower end surrounding the flue opening and an open upper end. A plurality of ventilation openings in the lower portion of the tubular housing draws air into the tubular housing. A plurality of exit openings are provided near the open upper end of the tubular housing. A removable heat deflector is attached to the open upper end of the tubular housing. A removable non-metal weather shield is fastened to the heat deflector to provide an enclosed chamber between the weather shield and the heat deflector. A receiver/transmitter within the enclosed chamber resides between the weather shield and the heat deflector.