Several related questions about Rhombics

Can any one point me to info on the design, building, care and feeding of
Rhombics?

Real estate is not a problem here, but I would like to have the feed points
for the antennas located close to my transmitter to keep feed lines short.
Can any one point me to mutual interference info on building two or more
80/40/20m Rhombics in close proximity to each other?


Imagine one antenna" main lobe oriented to Africa, another antenna's main
lobe oriented to Europe.
would there be a quick way to reverse these antennas main lobe directions
(180 degree reciprocal), from my shack?

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