Flood-it thanks for the correction. During training my instructor told how they were visual with Cyprus some 570 miles out. Also during the '72 Olympics we could receive the band 1 TV from Greece a few hundred miles away. Once I receive Italian RAI FM radio in UK. Also when at school we could see the Isle of Man over 65 miles away when we were on the beach.
No, my point was that ducting at visual wave lengths we less likely at night.