[Antennas] 160 Inverted L 160 Radials

[W3OA]

I'd like to put up a 160 antenna. I'm thinking of an inverted L.  The 
vertical section would be 54 feet and I have room for a horizontal 
section up to 157 feet long.  I am concerned about the radial field - 
it's approximately square, about 90 feet on each side.  Is this 
hopelessly small?  Should I try something like KE4UYP suggests at 
http://members.tripod.com/~KE4UYP/80m_160m_Antenna.html?  I'd like to 
hear of peoples success, or failure, trying his design.

Thanks for any suggestions - Dick, W3OA