As I mentioned earlier, I think the ban on signs should apply only to polling day and advance polling days, and not to the various special voting formats, where electors can vote in person at the office of the returning officer. Advertising in the media, on the radio, is not prohibited during the entire polling period at the polling station, so I do not see why this would be any different.
An elector who is on their way to vote at the office of the returning officer can hear a campaign ad on the radio and still cast their vote. We do not limit the ability to transmit advertising. Nor should we limit an individual's ability to post a campaign sign on their property or the ability of a political party to display signs near the offices of returning officers.
However, I think the current practice of restricting visual advertising on polling day, near polling sites, is a long-standing and generally respected tradition, one I do not see as a major problem.