 Later improvements in the capacity of cable or microwave and other links enabled the ABC to broadcast on an increasingly national basis, although even into the 1970s the debut screenings of some episodes were still weeks apart from one city to the next.Episodes continued to be broadcast weekly until mid-1966, generally in the same timeslot for each city that the programme had debuted in the previous year.By the time the last weekly episode was broadcast in June 1966 – episode 4 of "The Crusade" – first-run ABC episodes were still only around twelve months behind their original BBC transmission dates.