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READ what you just said,.......... a Horiz ant IS affected more by the ground,...........  and that causes about a 7 Db LOSS, not gain!

 

 the difference in gain between the antenna over a perfect ground and over a real ground is large. At low heights the antenna radiates about like an isotropic radiator at low radiation angles, with about a 7 dB losss to the ground.

 

it is aparent that mounting the dipole vertically reduces the sensitivity to the ground conditions and lessens the ground loss.