best ideas for a marine antenna
 

I am looking to set up a laptop on a boat that will receive wifi
signals. I need to install a twenty foot cable from the antenna to a
Proxim orinoco 8011b/g gold wireless card. I have found the cable but
don't know what antenna to attach to it as I want to minimize loss of
signal and I believe I have to get a certain length antenna to
synchronize with the cable length to do this. does anyone know what the
right size antenna should be and any suggestions on where to pick one
up?
I found the cable here
http://sharperconcepts.zoovy.com/pro...C-CA-RSPNMAXXX

http://www.kangaloosh.com/YachtTech/...ction.htm#WiFi read
this

http://www.kangaloosh.com/YachtTech/...ction.htm#WiFi read
this