Hi list: 

Just looking at some specs of a Zero Five 43F vertical. 
It says that it can be either ground mounted or on a tower. 
Can understand ground mounting because most verticals, to function properly, require a ground radial system with a min of 16 radials cut for the band you want to operate. 
So, why would you mount this kind of antenna on a roof or tower? 
If you add height, could you reduce the radial requirements? 

Oh, before I run: 
Still waiting on some digipan and window eyes 6 assistance and a recommendation on a screen reader friendly CW decoder. 

73: 
Mike