A system for automatically gathering information from one or more sensors on a performance of a sports action involving an object being hit or struck by a piece of sports equipment, the system comprising: one or more tags configured to be affixed to the piece of sports equipment, wherein the one or more tags comprise at least one Radio Frequency Identification (RFID) or Near Field Communication tag, and a wearable device comprising: a strap, the one or more sensors which comprise one or more swing sensors and at least one object contact sensor on the wearable device, the at least one object contact sensor being configured to detect a contact with the object by the piece of sports equipment, and a tag reader comprising an antenna (302; 502), the antenna being provided in and extending along or around the strap, the tag reader comprising a Radio Frequency Identification (RFID) or Near Field Communication tag reader; wherein the strap is adjustable to vary an adjustment position, circumference or length of the strap, the system comprises a strap sensor that is configured to determine the adjustment position, circumference or length of the strap, and the system is configured to adjust at least one operating parameter of, or compensation for, the antenna based on the determined adjustment position, circumference or size of the strap, and the system comprises a plurality of antenna matching circuits or systems, and/or an adjustable matching circuit or system, wherein the system is configured to adjust at least one operating parameter of, or compensation for, the antenna by selecting and/or varying one or more of the matching circuits or systems based on the determined adjustment position, circumference or length of the strap. one or more tags configured to be affixed to the piece of sports equipment, wherein the one or more tags comprise at least one Radio Frequency Identification (RFID) or Near Field Communication tag, and a wearable device comprising: a strap, the one or more sensors which comprise one or more swing sensors and at least one object contact sensor on the wearable device, the at least one object contact sensor being configured to detect a contact with the object by the piece of sports equipment, and a tag reader comprising an antenna (302; 502), the antenna being provided in and extending along or around the strap, the tag reader comprising a Radio Frequency Identification (RFID) or Near Field Communication tag reader; wherein a strap, the one or more sensors which comprise one or more swing sensors and at least one object contact sensor on the wearable device, the at least one object contact sensor being configured to detect a contact with the object by the piece of sports equipment, and a tag reader comprising an antenna (302; 502), the antenna being provided in and extending along or around the strap, the tag reader comprising a Radio Frequency Identification (RFID) or Near Field Communication tag reader; wherein the strap is adjustable to vary an adjustment position, circumference or length of the strap, the system comprises a strap sensor that is configured to determine the adjustment position, circumference or length of the strap, and the system is configured to adjust at least one operating parameter of, or compensation for, the antenna based on the determined adjustment position, circumference or size of the strap, and the system comprises a plurality of antenna matching circuits or systems, and/or an adjustable matching circuit or system, wherein the system is configured to adjust at least one operating parameter of, or compensation for, the antenna by selecting and/or varying one or more of the matching circuits or systems based on the determined adjustment position, circumference or length of the strap.