Home advantage in football varies over time. Existing theories of home advantage struggle to explain this time-series variation. We argue that the decline in home advantage in English football since the mid-1980s was partly caused by the advent of televised football. We argue that the increase in live television coverage of football matches has worked to incentivize players to not to shirk when playing in away games, as supporters can now more effectively monitor their efforts. We test this hypothesis using both time-series and panel-data econometrics.