I recently purchased a new desktop (Gateway DX4860) with a Ralink (RT3090??) wireless lan card. I presently do not have network--simply use Comcast as my ISP with a wired connection between the modem and the PC. With the antenna attached the wireless card "sees" perhaps 15 wireless networks in my apartment complex. My concern is security. If my set-up can "see" approximately 15 wireless networks, obviously my SSID can be seen by approx. the same number of networks. My question: do wireless LAN cards contain security? If so, is it adequate? If not, how does someone secure a basic set-up such as the one just described?