Originally Posted by Bene505
The modern radar reflector uses exact 90 degree angles to create a large echo. (Think about the game Pong where you aim the ball into a corner and it comes right back at you.) It's worth the $50 to get one, rather than experimenting with somehting that will not work very well versus the space it takes-up aloft. In other words, if you took $50 of aluminum foil crunched it a bit and wrapped it around 5 huge cardboard boxes that were used to ship refrigerators, and then hoisted that aloft, it would probably relfect about as well as the modern $50 reflector - and maybe not.
It's $50 well spent and you may even be able to pick one up on eBay or Craigslist for cheaper than $50.
This looks like a useful article
. It's about radar reflectors for kayaking - but I imagine that the info would be comparable to sailboats (just the ranges would be longer).
It seems as though the tin-foil hat I wear anyway would also work to reflect radar...
1989 Hunter 30'
Southern Georgian Bay
The sea, once it casts its spell, holds one in its net of wonder forever. - Jacques Yves Cousteau