System for determining performance characteristics of a golf swing

A golf club comprising:

• a club head configured to be operatively connected to a shaft comprising:
• a source of ultrasound waves configured to be reflected from a golf ball towards the club head;
• and
• an array of ultrasound sensors configured to receive the ultrasound waves reflected from the golf ball, wherein at least one sensor of the array comprises the source of ultrasound waves, and a weight of the array of ultrasound sensors and the source of ultrasound waves does not change a balance or a location of a center of gravity of the club;
• and
• an antenna that comprises a ferrule that connects the club head to the shaft for wirelessly transmitting swing data related to the received ultrasound waves to a portable computer device.