An Informed Guess.. all radio waves are bent in the atmosphere the same
way as light bends through glass or water, the higher frequencies are
bent less but at the frequencies used there must still be enough useable
return signal at a third more distance than expected.

Michael Mcneil wrote:
"Martin Rowley" m wrote
in message


http://www.booty.org.uk/booty.weather/FAQ/3.htm#3.19

--
Les Crossan,
Wallsend, Tyne & Wear
54.95N 1.5W
Home of the Wallsend StormCam and the Backup USW FAQ -
www.uksevereweather.org.uk