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HFTA (HF terrain analysis) will show you more info about take off angles in several directions which are much more important for DX. I would like a copy but need to buy the ARRL antennabook for that I guess. It is so unfortunate we can't download the software somewhere on the internet? It has probabely a copyright by the ARRL. I think I have to look out for the book which we cannot buy here in the Netherlands as far as I know (sold out at the VERON).