A transmitter device for use in a vehicular application includes a cable, an input port, a modulator, and an antenna device. The cable of the transmitter device receives power from a power source associated with a vehicle to power circuitry in the transmitter device. The input port of the transmitter device receives audio input from a user in the vehicle speaking into a microphone. The modulator device modulates the audio input received from the input port onto a carrier frequency to produce a modulated signal. The antenna device of the transmitter device receives the modulated signal and generates (e.g., transmits) a wireless radio signal to a radio receiver in the vehicle. The radio receiver in the vehicle is tuned to i) receive the wireless radio signal and ii) play the audio input received from the user over at least one corresponding speaker associated with the radio receiver.