A high frequency communication apparatus (100, 200, 300, 400) for a vehicle, the high frequency apparatus using a single cable (190, 290, 390, 490) and comprising: a communication module (110, 210, 310, 410) connected to an end of the single cable and configured to transmit a radio frequency, RF, signal and to transmit a transmit, TX, serial communication signal, the communication module including a TX serial communication modulation circuit configured to modulate the TX serial communication signal from a first digital signal to a first alternate current, AC, signal in a first frequency band different from a second frequency band of the RF signal, and a receive, RX, serial communication demodulation circuit configured to demodulate a modulated RX serial communication signal received through the single cable to a second digital signal; and an antenna module (150, 250, 350, 450) connected to an other end of the single cable and configured to receive and branch the RF signal and the TX serial communication signal, the antenna module including a front end module configured to process the RF signal, a TX serial communication demodulation circuit configured to demodulate the TX serial communication signal from the first AC signal to the first digital signal, a controller (152, 352, 451) configured to receive the demodulated TX serial communication signal to control the front end module and output an RX serial communication signal, and an RX serial communication modulation circuit configured to modulate the RX serial communication signal to a second AC signal in a third frequency band different from the second frequency band of the RF signal and the first frequency band of the TX serial communication signal, characterized in that the communication module further comprises a power circuit configured to supply power to the antenna module via the single cable, and the communication module further comprises an RF block filter configured to reduce the entrance of an RF signal to the power circuit. a communication module (110, 210, 310, 410) connected to an end of the single cable and configured to transmit a radio frequency, RF, signal and to transmit a transmit, TX, serial communication signal, the communication module including a TX serial communication modulation circuit configured to modulate the TX serial communication signal from a first digital signal to a first alternate current, AC, signal in a first frequency band different from a second frequency band of the RF signal, and a receive, RX, serial communication demodulation circuit configured to demodulate a modulated RX serial communication signal received through the single cable to a second digital signal; and a TX serial communication modulation circuit configured to modulate the TX serial communication signal from a first digital signal to a first alternate current, AC, signal in a first frequency band different from a second frequency band of the RF signal, and a receive, RX, serial communication demodulation circuit configured to demodulate a modulated RX serial communication signal received through the single cable to a second digital signal; and an antenna module (150, 250, 350, 450) connected to an other end of the single cable and configured to receive and branch the RF signal and the TX serial communication signal, the antenna module including a front end module configured to process the RF signal, a TX serial communication demodulation circuit configured to demodulate the TX serial communication signal from the first AC signal to the first digital signal, a controller (152, 352, 451) configured to receive the demodulated TX serial communication signal to control the front end module and output an RX serial communication signal, and an RX serial communication modulation circuit configured to modulate the RX serial communication signal to a second AC signal in a third frequency band different from the second frequency band of the RF signal and the first frequency band of the TX serial communication signal, a front end module configured to process the RF signal, a TX serial communication demodulation circuit configured to demodulate the TX serial communication signal from the first AC signal to the first digital signal, a controller (152, 352, 451) configured to receive the demodulated TX serial communication signal to control the front end module and output an RX serial communication signal, and receive the demodulated TX serial communication signal to control the front end module and output an RX serial communication signal, and an RX serial communication modulation circuit configured to modulate the RX serial communication signal to a second AC signal in a third frequency band different from the second frequency band of the RF signal and the first frequency band of the TX serial communication signal,