I have difficulty with consistent,strong signal to internet. My internal adapter port is damaged, and must use a USB wireless network adapter. I have a Dell Inspiron 1720, with Vista. What is the best rated USB network adapter for my computer? I'd like one that is portable,has an antenna (internal?),reliable,gets a strong signal through walls and yard. I don't want one too big as to damage my USB port from getting bumped. Thanks for all your help!