[Antennas] Modeling Help Requested for 2 FD antenna ideas

[W3HKK at aol.com]

Im looking for an 80M antenna to give me radiation in the  30-60 degree range 
for field day, but the max antenna ht will only be around  35-40 ft.  
 
Two thoughts come to mind:
 
1.  an elongated tilted   rectangular loop 90  ft on top and bottom and  40 
ft on each side.  the loop would  be tilted  at 45 degrees to get the  bottom 
wire about 10 ft off  the ground.    My questions are: what would be the max 
radiation  angle   and would it favor the direction of the slope or away from  
it?    Would it perform best  fed in the center or at a  corner, for FD 
purposes...ie for most of the US  on 80M.  
 
Also, how would it perform on 40M?   for  FD  purposes.
 
2.  An 80m  bob-tail curtain with three qtr wave  vertical elements suspended 
from  two half wave segments at both ends and  the middle.   But since an 80M 
bobtail is  66 ft long vertically  and my  max support ht is 35-40 ft, I 
would have to tilt the  vertical  elements at a 45 degree angle.  So we have a 45 
degree tilted bobtail  curtain, in effect.  
 
Same questions as above.  What is the max radiation  angle   and which way 
does it favor.  A conventional  BTC  with 3 vertical elements radiates both 
perpendicular to and in the plane of the  antenna in a clover leaf pattern.  but 
at angles  under 30  degrees.  Im hoping the tilting would raise the max lobe 
to a more  acceptable  45-60 degree range.  The antenna is a direct feed into 
one  corner with 52 ohm coax and yields a 1:1 swr at resonance.  
 
Can anyone help me?   thanks
 
de Bob  W3HKK