Diversity receiving apparatus for a mobile unit

A diversity receiving apparatus for a mobile unite, comprising:

• a plurality of antennas for receiving a radio wave television signal;
• first switching means for selecting one of said plurality of antennas and supplying said radio wave television signal from one of said plurality of antennas;
• second switching means for selecting one of said plurality of antennas and supplying said radio wave television signal from one of said plurality of antennas;
• divider means for coupling said plurality of antennas to first and second switching means;
• first receiving means for receiving said radio wave television signal from said first switching means and supplying a first channel of a first television signal including a synchronizing signal;
• second receiving means for receiving said radio wave television signal from said second switching means, said second receiving means including tuning means for effecting tuning to select a second channel of second television signal which is the same as said first channel;
• level detection means for detecting a level of said second television signal;
• noise level detection means for detecting a noise level included in said second television signal;
• and
• control means responsive to said synchronizing signal for determining one of plurality of antennas to be selected by said first switching means for the following vertical scanning period of said television signal wherein said control means controls said second switching means and said level detection means to successively supply said radio wave television signal from each of said plurality of antennas to said second receiving means during a vertical retrace period of said television signal to detect said level derived from said each of plurality of antennas, controls said second switching means and said noise level detection means to detect noise levels from a first antenna of said plurality of antenna selected for previous vertical scanning period of said television signal and a second antenna providing a largest level except said first antenna, and determines either of said first and second antennas to be selected by said first switching means for the following vertical scanning period of said television signal in accordance with the detected noise levels.