I am seriously lusting over the concept of putting together a
foursquare array of 40M verticals.

I found the http://www.zerofive-antennas.com/ website and the antenna
part looks do-able. If a bit heavy-duty!

I think I have the space in the yard to put down the radials. The
house gets in the way of one direction but I think I can put down at
least quarter-wavelength radials from each base in all directions and
half-wavelength or longer in some other directions.

I have some old ARRL antenna handbooks with articles by Roy Lewallen
about phasing arrays and measurements. I also have EZNEC. Is there
something I can do to prove to myself that having my house on one side
of the array and the edge of my lot on the other side of the array,
resulting in a radial plane that's not radial but more like a
rectangle, won't mess up the whole concept?

And if I draw things out it looks like an 80M foursquare array would
be possible but my house would be in the middle of it :-). Is this a
recipe for disaster or would it actually work? (Not that I could
afford four 75-foot vertical radiators from zerofive, but I can
imagine!)

Tim.