Keywords: 1st Fresnel Zone Avoidance.png Uploaded with en wp UW marker 2015 07 16 Fresnel zones are concentric ellipses centred on the direct transmission path The 1st zone is the ellipse with chords 1/2 wavelength longer than the direct path I used iDraw to make the graphic and Preview to capture it for my own courseware 2015-07-16 Jugandi |