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.
https://www.rfcafe.com/references/electr ... -sight.htm
Here is a radar cross-section page as well.
https://www.rfcafe.com/references/electr ... ection.htm
https://books.google.com/books?id=YtndXb ... 22&f=false
https://www.dreamlandresort.com/black_projects/rcs.html
...here are some typical RCS values for different
objects from the "Radar Engineer's Sourcebook" by
Morchin:
Object RCS in Square Meters
B-52 125
B1-B 1
Cessna 180 1.5
Cabin
Cruiser 10
Navy Cruiser 14,000
Pickup Truck
200
Automobile 100
Bicycle 2