Again today, Israel, Morocco and Italy have been enjoying TEP propagation deep into the Southern Hemisphere on 6m. In vain, I've been on 6m too hoping that some early Es might link me into the 6m TEP propagation areas. Up to now I have had no luck at all, copying just G6AVK and G3XGS only on 6m WSPR at around 70km.
Here is another TEP article: http://www.qsl.net/vk2kfj/tep.html . This states that TEP can occur up to at least 432MHz. I'd settle for a little at 50MHz!