Topband: DECOUPLING RF

[Dxhogg at aol.com]

I have a 1/4 wave vert with 8 raised radials the feed point is 8 ft off the  
ground it is fed with 600 ohm open wire line would there be any advantage by  
installing ferrite cores to  the radial side of the feed line where the  feed 
line meets the 16 radials i have tried this and what i have observed is the  
swr does not change but am able to couple more power to the antenna given  the 
same amount of drive to the  amplifier as with out the cores  installed...any 
thoughts about this      73  ray  nr1r