Soooooooo signals "above 30 MHZ" just keep on going?
? I guess all the 6 meter DX I have worked over the years was groundwave, then. Before VK and ZL got off the old TV channel 1 and 2 there were TV DXers HERE who picked them up. (Yes, Channel 1 WAS used in Europe and elsewhere) . I've heard broadcast FM band openings into the deep south on my car radio. I guess it's all a hoax.
My bad for being too broad. Clarification: my understanding is that it all depends on the MUF. I would say "above 60 Mhz" but then some guy would come in saying "but I get FM skip all the time!" which my understanding is that it's a different phenom than F layer skip. DX as regards the old analog system, with K0RGR's comment about channel 2,3,4 skip, either that was due to a very high MUF or it was E skip or tropo. I know that Australasia used TV channel 1 and even a ch 0 in VK land, but I don't know what freqs those were assigned, so I won't comment. Channel 1 in the US had to be abandoned because it behaved more like SW than FM.