I was the guy who went out, bought and tested them on my Linksys WAP11. Do
a google news group search for "radio shack orfanakos" and you will find all
the different discussions on this topic.
My tests were simple:
1) Using NetStumbler, and an Orinoco Silver card, I tested orig. antenna
versus RS antenna - and there was a measurable improvment at various
distances and locations.
2) Using the orig. antenna - I took my laptop to spots were I had weak or
no signal..... Then I changed antenna to RS, and went to the same
spots...and the signal was better/improved.
Scientific tests - no
Earth shattering results - no
Measurable Improvements - yes
Drastic Improvements - not really
I kept the antenna and now use them on two WAP11's I have set up as a
wireless bridge connecting two buildings together.....about 75 feet apart.
The other part that helped was hacking the WAP11's and increasing signal
strength.
http://www.seattlewireless.net/index.cgi/Wap11Hack