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huh????????????   BASIC antenna theory,............radiation angle is a function of height over ground.

 

 

if your modeling program doesn't show a difference between "normal" and "inverted" configurations, then the software is deficient..

 

the TOA is the MIN angle, there is also a MAX angle too.  what we are concerned with is the vector area SHIFT contained BEWEEN the 2 when an antenna is inverted.

 

 by  changing the relative TX antenna height , the "cone" of radiated RF is directed at, below, or above the RX antenna, this is true with both inverted and normal mounted vertical antennas.