How I Would Pick Up a Wifi Hotspot and ShareThe Connection Out Between 4 Pc

Hi, i want to pick up wifi from a hotspot which is about a mile a way, i have found this wifi antenna ( http://uk.wifi-link.com/product.php?action=product&class1_id=1&class2_id=3&class3_id=564&product_id=1509 )

I want to be able to share the connection from the wifi antenna, to my 4 computers, so they can all pick up wifi.

I have emailed them and they say I need a router, which is to be set in client mode, and that the detachable ariel will have to be replaces with the cable of the antenna.

I was wondering if any body new how i would connect the router to my 4 computers, would i use ethernet and then install some software or what, i would be greatfull for any advice that you could give me.