To increase my 2GB memory iMac EMC 2210 to 4Gb I will need 1, 2GB memory stick or 2, 2GB memory sticks?

Test it by moving right next to your WiFi modem to see if the network name appears. My Voyager 3 would constantly look for a network with nothing found. I was walking next to the WiFi router and suddenly saw the network name on the screen. The bad news is it only worked when I was within 3feet of th WiFi router. Bad antenna on the Voyager? So Do I take it apart and look for the antenna? Does it need reattached? I need a break down and a location of the antenna. let me know if you find out anything. tom