http://www.lazygranch.com/images/wifi/wifi_bq_1.jpg
http://www.lazygranch.com/images/wifi/wifi_bq_2.jpg

Yeah yeah, there are specs of solder on it and I didn't remove the
stray flux. Whatever.

I used a n to n adapter with one of the fittings hacksawed off. The
loop is the standard circumference, but in a circle rather than a
square to make life easier.