I am using a Cisco e4200v1 wireless router connected to DISHNET satellite. House is 7200 sqft with three floors and phone service is OOMA type. All clients are 11n capable and single ethernet is 10/100/1000. Five client PCs, three smartphones, three tablets, two laptops, printer, game console connect at various times (many simultaneous). Throughput and Internet connectivity is usually poor. Farthest distance client is 35 ft from router and is aided by Cisco A1000 extender (sub LAN). Some interference in line-of-sight by HVAC ductwork for clients. Win7 on all clients, one with Win8.1. Connectivity monitor (Windows) shows either no IPv6, IPv4 or just no IPv6 at most times of the day. Any suggestions on improving signal to clients? Would using the ASUS A68U work better at increasing throughput for 11n adapters and better if replaced by Netgear A6200 adapters?