On our wifi network, we have a MBP 17", an iPad (first gen), and a wii. That's it. We're currently using an old, cheap router. When the MBP is directly plugged into the router via ethernet, online speed tests show that it gets (approximately) the speed our ISP promised: ~15 Mbps download, ~3 Mbps upload. When you unplug the MBP and use it on the wifi network, speed tests show dramatically slower results. I suspect that in addition to being old, the router is somehow broken. If we were to replace the router (most likely with airport extreme base station), would anyone know approximately what speed levels I should expect when running on wifi? My understanding is that it's still somewhat slower than when directly connected, but I'm just wondering how much slower? Thank you for any information/insights.