Netscape is browser, Netgear is probably what you're seeing because the default router name is usually the company name.
The way to find out is have your sister go into the control panel for the router and name the router. While shes at it have her secure it to prevent someone from accessing it. For example, some mischievous kid could lock you out of it and it would require hard reset, not really a big deal but that is probably the lest of your worries. If she has sicko neighbor who uses it to download some child porn that is going to come back to her.
If the router is not your sisters its illegal and a felony in some states to access it. This is one of those crimes rarely prosecuted.
You can try this with the antennae, won't cost you anything and it does work:http://www.freeantennas.com/projects/template2/