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AGL Above Ground Level. Height above common ground to the the mid-point of the radiating antenna.
AMSL Above Mean Sea Level. Height referenced above sea level, or zero elevation.
The K factor accounts for refraction of radio waves close to the surface of the earth. For antenna towers less than a couple of thousand feet above the surface, a K factor of 1.33 is usually adequate for most line-of-sight calculations over average terrain.Typical Values of KSummer Winter Dry mountains (above 1500 meters) 1.20 1.20 Mountains (to 1500 meters) 1.25 1.25 Midwest and Northeast 1.50 1.30 South and West Coast 1.55 1.35 Southern Coast 1.60 1.50