Could you tell us what is a sufficient RADAR target?

I'm afraid I can't give you any substantive help shopping for a RADAR
reflector. There was a long thread on this a couple of weeks ago that
might be helpful.

They say that in my area many commercial ships from a certain country do
not really keep RADAR watch, only listen to a possible radar warning
while reading magazines and having tea. Does that seem possible?

Possible? Anything is possible, but as I've posted earlier, that has
not been my experience. There have been exceptions though, as I posted
earlier.

Where would you like the yachts to have their navigation lights?
Masthead or deck level? Masthead is seen from further away, but misleads
with regard to distance.

By all means, I'd rig the biggest, brightest navigation lights you can
either at the masthead (tri-color if the size of your yacht allows it)
or the "red over green" additional lights on your mast. More
information on the proper location of these lights can be found in COLREGS.

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