I have compared the Tempest and found that it can not achieve 1km line of site. For those of us requiring wind measurements at very long distances without paying for a mobile phone connection the Sky was the solution.
Are you suggesting trying the Tempest antenna in a better location? Like if it hung down the inside of the mounting pole using a plastic pole? Or are you referring to the new cellular remote version of the Tempest?
I know of several freinds holding off their purchases waiting for the cellular remote version of the Tempest.
Cheers Ian 
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