Automotive antenna system

An automotive antenna system comprising:

• first high frequency pick up means for detecting vehicle surface high frequency currents induced on the vehicle surface by broadcast waves flowing concentratedly on the vehicle body and for outputting a signal in response to the detected vehicle surface high frequency currents, said first high frequency pick up means being disposed on a first side of the vehicle at the front of the vehicle;
• second high frequency pick up means for detecting vehicle surface high frequency currents induced on the vehicle surface by broadcast waves flowing concentrically on the vehicle body and for outputting a signal in response to the detected vehicle surface high frequency currents, said second high frequency pick up means being disposed on the first side of the vehicle at the rear of the vehicle;
• first combining means for combining the output signals received from said first and second high frequency pick up means and outputting a combined signal;
• third high frequency pick up means for detecting vehicle surface high frequency currents induced on the vehicle surface by broadcast waves flowing concentratedly on the vehicle body and for outputting a signal in response to the detected vehicle surface high frequency currents, said third high frequency pick up means being disposed on the second side, opposite the first side, of the vehicle at the front of the vehicle;
• fourth high frequency pick up means for detecting vehicle surface high frequency currents induced on the vehicle surface by broadcast waves flowing concentratedly on the vehicle body and for outputting a signal in response to the detected vehicle surface high frequency currents, said fourth frequency pick up means being disposed on the second side, opposite the first side, of the vehicle at the rear of the vehicle;
• second combining means for combining the output signals received from said third and fourth high frequency pick up means and outputting a combined signal;
• selection switching means for selecting any one of the combined output signals from said first and second combining means for input to a receiver, comparing the selected combined output signal to a predetermined thereshold level and switching to the other one of the combined output signals from said first and second combining means for input to the receiver when the selected combined output signal is lower than the predetermined threshold level.