Think this is important...
"The Standard Tri Lens performs similarly to the Large Tri-Lens although the peak RCS is low at about 3.75m2. It is very consistent up to an elevation angle of 20˚ with the average RCS only varying by 0.07m2."
In other words, this reflector, which is nowhere near 10m2, is the one that functions most consistently up to 20 degrees of heel. Note that the tri-lens is available in three sizes, Large, Standard and Mini. They didn't test the mini.
This thing weighs 5.5 pounds, not ideal for hoisting into the rigging, but if you have a stern arch, maybe. Of if you have an articulating radar arch, the reflector can be mounted directly below the dome, maybe?
How to fit this on a Santa Cruz 27? Oyyyyyyy....
Prices:
West Marine, $149
Defender: $195
http://www.defender.com/product.jsp?path=-1|135|275622&id=303297
Finally, again the Mobri-style comes out at the bottom, with massive drop-off of signal at more than even just 1 degree of heel. Note that the one they tested was the four-inch. I personally own two, two-inchers. I won't throw mine away, I mean, I got 'em so I'll use them, but I won't be buying any more.
1968 Selmer Series 9 B-flat and A clarinets
1962 Buesher "Aristocrat" tenor saxophone
Piper One Design 24, Hull #35; "Alpha"