Which frequency band has the smallest first Fresnel zone?
Fresnel-zone radius decreases as wavelength decreases, so the highest listed frequency, 5.8 GHz, has the smallest first Fresnel zone.
Amateur Extra · FCC Element 4 · answer reveals automatically
Fresnel-zone radius decreases as wavelength decreases, so the highest listed frequency, 5.8 GHz, has the smallest first Fresnel zone.