A wrist-worn electronic device configured to transmit and receive wireless signals in two frequency bands, the electronic device comprising: a housing (12, 112) including a bottom wall configured to contact a wearer's wrist, and a side wall with a lower edge coupled to a perimeter of the bottom wall; a bezel loop antenna configured to wirelessly receive a first electronic signal and a second electronic signal simultaneously, the bezel loop antenna formed from electrically conductive material, having a first impedance, and positioned above an upper surface of the side wall; a printed circuit board (30, 130) retaining an electrically conductive signal terminal electrically connected to a first contact point on a lower surface of the bezel loop antenna, an electrically conductive ground terminal electrically connected to a second contact point on the lower surface of the bezel loop antenna, and an electrically conductive tuning terminal electrically connected to a third contact point on the lower surface of the bezel loop antenna; a first signal processing element retained on the printed circuit board (30, 130) and configured to process the first electronic signal having a frequency in a first frequency band; a second signal processing element retained on the printed circuit board (30, 130) and configured to process the second electronic signal having a frequency in a second frequency band; a diplexer (38, 138) retained on the printed circuit board (30, 130), electrically connected to the first signal processing element, the second signal processing element and the signal terminal, the diplexer (38, 138) configured to: receive the first electronic signal and the second electronic signal from the signal terminal, and output the received first electronic signal to the first signal processing element and the received second electronic signal to the second signal processing element; and a tuning element retained on the printed circuit board (30, 130) and electrically connected to the tuning terminal and having a second impedance causing the bezel loop antenna to wirelessly receive electronic signals in the first frequency band and electronic signals in the second frequency band. a housing (12, 112) including a bottom wall configured to contact a wearer's wrist, and a side wall with a lower edge coupled to a perimeter of the bottom wall; a bezel loop antenna configured to wirelessly receive a first electronic signal and a second electronic signal simultaneously, the bezel loop antenna formed from electrically conductive material, having a first impedance, and positioned above an upper surface of the side wall; a printed circuit board (30, 130) retaining an electrically conductive signal terminal electrically connected to a first contact point on a lower surface of the bezel loop antenna, an electrically conductive ground terminal electrically connected to a second contact point on the lower surface of the bezel loop antenna, and an electrically conductive tuning terminal electrically connected to a third contact point on the lower surface of the bezel loop antenna; a first signal processing element retained on the printed circuit board (30, 130) and configured to process the first electronic signal having a frequency in a first frequency band; a second signal processing element retained on the printed circuit board (30, 130) and configured to process the second electronic signal having a frequency in a second frequency band; a diplexer (38, 138) retained on the printed circuit board (30, 130), electrically connected to the first signal processing element, the second signal processing element and the signal terminal, the diplexer (38, 138) configured to: receive the first electronic signal and the second electronic signal from the signal terminal, and output the received first electronic signal to the first signal processing element and the received second electronic signal to the second signal processing element; and receive the first electronic signal and the second electronic signal from the signal terminal, and output the received first electronic signal to the first signal processing element and the received second electronic signal to the second signal processing element; and a tuning element retained on the printed circuit board (30, 130) and electrically connected to the tuning terminal and having a second impedance causing the bezel loop antenna to wirelessly receive electronic signals in the first frequency band and electronic signals in the second frequency band.