Abstract: Wireless audio receiver devices are described. In an embodiment, a wireless audio receiver device includes a first helical (helix wound) receive antenna and a second helical receive antenna, a printed circuit board (PCB) comprising receiver circuitry coupled to the first helical receive antenna and the second helical receive antenna, a first audio driver and a second audio driver, a first audio lead wire connected to the PCB and to the first audio driver and passing through the windings of the first helical antenna, and a second audio lead wire connected to the PCB and to the second audio driver and passing through the windings of the second helical antenna.

Abstract: Systems and methods for underwater coaching systems in accordance with embodiments of the invention are disclosed. In one embodiment, a wireless communication system includes a receiver system including a receive antenna configured to receive a radio frequency signal, at least two impedance matching networks, a first water-adapted impedance matching network adapted for reception in a water environment and a second air-adapted impedance matching network adapted for reception in an air environment, a switch configured to select between the at least two impedance matching networks, a signal decoding circuit configured to decode a received radio frequency signal, an amplifier configured to amplify a decoded signal, and a user output.

Abstract: Systems and methods for underwater coaching systems in accordance with embodiments of the invention are disclosed. In one embodiment, a wireless communication system includes a receiver system including a receive antenna configured to receive a radio frequency signal, at least two impedance matching networks, a first water-adapted impedance matching network adapted for reception in a water environment and a second air-adapted impedance matching network adapted for reception in an air environment, a switch configured to select between the at least two impedance matching networks, a signal decoding circuit configured to decode a received radio frequency signal, an amplifier configured to amplify a decoded signal, and a user output.