There are two things to take in consideration. One is the distance between the two sites. If the distance is less than a mile away with clear line of site, then you could possibly use the 350 wireless bridge at the main site and a 350 workgroup bridge at the site with 3-4 computers. If the distance between the sites is a mile or more, then you should use two 350 wireless bridges to connect the sites. You will be better off, no matter what, using two 350 wireless bridges in the long run.