Antill's senior club rowing has been from the ANU Boat Club. Antill first made state selection for the Australian Capital Territory in their 2015 men's eight competing for the King's Cup at the Interstate Regatta. In 2018 and 2019 he was the ACT's single sculling entrant and raced for the President's Cup at the Interstate Regatta. At the 2017 Australian Championships he won the open men's quad scull national title rowing with Luke Letcher, Hamish Playfair and David Watts. In 2019 he again won the Australian national quad scull championship in a composite SUBC /ANU Boat Club. Antill competed for the ANU Boat Club at the 2014 and 2015 Intervarsity Championships. In 2014 he rowed in the ANU eight, a coxed four and a coxless pair. In 2015 he competed in the coxed four and won the double-sculls university championship title with Luke Letcher.
International rowing career
Antill made his Australian representative debut in 2016 at the U23 World Rowing Championships in Rotterdam where he raced in Australia's U23 quad scull to an U23 World Championship title and a gold medal. In 2017 he was Australia's single sculler at the U23 World Championships in Plovdiv. He made the A final and finished in sixth place. He was the men's sculling reserve at the 2017 senior World Championships in Sarasota. He made his first Australian senior appearance in 2018 in the Australian squad scull. With Luke Letcher, Alexander Purnell and David Watts they raced at two World Rowing Cups and then at for the 2018 World Rowing Championships Letcher was changed out for Campbell Watts. With Antill in the bow seat that crew placed third in their heat and then in the repechage went out hard and alongside New Zealand they surprised the Lithuanian world champions knocking them out of the final. In the final the Australian quad rowed through most of the field from the 1000m mark and finished in second place to Italy for a silver world championship medal. In 2019 he was selected with Purnell, Watts and Cameron Girdlestone to row Australia's quad scull for the 2019 international season. They placed 2nd at the World Rowing Cup II in Poznan and 4th at WRC III in Rotterdam. Antill and David Bartholot were selected to race Australia's double scull at the 2019 World Rowing Championships in Linz, Austria. The double were looking for a top eleven finish at the 2019 World Championships to qualify for the Tokyo Olympics. They were second in their heat, third in their quarter-final and fourth in their semi-final. They finished sixth in the B-final for an overall twelfth world place and failed to qualify the boat for Tokyo 2020.
