I am getting my system installed tomorrow. I am supposed to be able to get MRV and On Demand through my wireless internet. I do NOT have a router. I explained this to the Directv Representative and they guaranteed me that I would be able to get MRV and On Demand just through a wireless adapter the installer would install free of charge. Does this seem right? I've tried to reading about MRV and the Wireless adapters but I'm having a hard time understanding.