deepbluesky said:Looks like it was Tropospheric Superrefraction or Ducting/Trapping in the SHF band as shown in _http://www.users.bigpond.com/vk2krr/DUCTING.htm. I wonder how big fluctuations can be and if there can be given a probability for occuring or not like in _http://www.dxinfocentre.com/tropo_eur.html
Thank You for great links
