[Antennas] Inverted "L"

[Jim Isbell]

I have just put up an inverted "L" with a 26' vertical section and a 70' 
horizontal section.  It really works well, much better than my 40 meter 
dipole it replaced.  BUT it seems to be very directional off the sides 
of the horizontal section so I am considering adding a second inverted 
"L" oriented at 90 degrees to this one and a switch to switch a relay at 
the base of the antennas to switch between the two.  Since the vertical 
section of both antennas will be only about 8" apart, will I have any 
problems with the "dead" antenna affecting the pattern of the "live" one?