Hi jpemusic. I fould a line of sight claculator
on RF Cafe that you can use to calculate your ditance.
If you say power is no problem then you can paint
just about any size target.
http://www.rfcafe.com/references/electr ... -sight.htm
Here is a radar cross-section page as well.
http://www.rfcafe.com/references/electr ... ection.htm
http://books.google.com/books?id=YtndXb ... 22&f=false
...here are some typical RCS values for different
objects from the "Radar Engineer's Sourcebook" by
Object RCS in Square Meters
Cessna 180 1.5
Navy Cruiser 14,000