ORIGINAL: APMECH
The Fresnel Zone is independent of frequency and is determined by distance ( i.e. Curvature of the earth and line of site. So there should be no difference between the 72MHz and 2.4GHz frequencies.
Fresnel zone takes frequency into consideration!
http://en.wikipedia.org/wiki/Fresnel_zone
(Frequency won't post)
Did several reams of paper worth of these calculations back before software was available for point to point calculations (back in the 6gHZ days)
