I was modeling a 5el 20m yagi. I changed antenna
height over realistic ground. As I expected, lowering
from 50' to 25' changed the take off angle from 18
degrees to 28 degrees.

What suprised me was the forward gain went from
14.44 dbi (@50') to 12.63 dbi (@25').

Is this normal?

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Just my 2¢... 73 es gd dx de Ken KGØWX
Grid EM17ip, Flying Pigs #-1055
Proud builder & owner of Elecraft K2 #4913