Growing up in New Zealand, my brother and I used to listen to "The World Tomorrow", broadcast as 30-minute shows on one of the Auckland radio stations at night in the mid to late 1970s. It was either Herbert W. Armstrong or his son Garner Ted Armstrong, who did the talks, pointing to the fulfilment of Bible prophecy. They offered copies of The Plain Truth to anyone who wrote and asked for it, so we did, and we used to then send away for glossy books that dealt with subjects such as famine and pollution, showing how these things were a sign that the end was nigh.
They then set off for a series of tours of New Zealand, hiring halls to give talks. We were very convinced, though we didn't take it any further .... it's quite likely it laid the groundwork for my acceptance of the JW's message when they turned up on my door some years later. I remember being told years ago that Herbert had left the JWs decades earlier and formed his own religion with variants of the JW message, and it's true there were similarities, though it seems the WCG seemed to have its own leadership dramas at some point.