TopBand: Elevating my inverted L ??

[Steve Narducci]

Hopefully I won't stir up a hornets nest with this question.  How high
should I 
elevate my inverted L ?  My tower is a 90' guyed and currently, the
inverted L goes
from the ground (with short radials) to the top of the tower and bends for
40 some
feet out.  I have heard if I elevate it with 4 to 8 1/4 wave radials it
would be 
better.   However, how high should I go and is this worth the trouble of,
or should
I invest heavily in lots-o-radials burried style ?  Thanks in advanced
guys...Steve

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