Extreme Tropo Propagation on 144 MHz and up... by LA0BY

I came across this PDF presentation while I was browsing about propagation at 144 MHz. It was put together by Stefan LA0BY and I think anyone with an interest in two metres should find it of interest.

The PDF document can be found here... http://www.la0by.darc.de/190615_LA0BY_Tropo%20extreme.pdf