2.4 link signal strength

I have a first class project in tow to put a 2.4GHz link in to the club about 4.5 miles away. I’ve just secured 5 grid dishes with 24dbi of gain for £125. What is a Fresnel zone and how do I spell it?

Anyway, there’s this great site to calculate the potential likelihood of succeeding in putting a link up between one site and another:


It also gives you the dreaded Fresnel Ellipse data which I think I’m slowly starting to understand – essentially, you can block around 40% of the ellipse in one place and the link should still work, but no more. Google it for more.