bluestreak56 said:
sp3ctre Ive done this, two different routers (different manufacturers) and extend the same existing SSID.
Its very easy, you just need to have the ability to set one up as an extender. I can rummage through my instructions again if you need help.
It's not difficult to give different routers/access points the same SSID - the problem is one of handoff, as, when you transition between coverage areas, you don't connect to the next AP unless you lose connection with the old one. As long as your device thinks that it has a strong enough wlan signal it doesn't switch to a different access point regardless of the difference in signal strength between APs
This is an inherent issue when devices follow the standards as they only have to check for signal strength at the point of connection to a network - sharing a SSID between APs can work well enough but devices will often cling on to a weak/slow connection to an AP when there's a much stronger signal available and, at times, you have to force the connection to the stronger AP by disabling & re-enabling WiFi
There are a number of commercial solutions that cope with the handoff issue and allow seamless roaming between APs with the devices automatically transitioned to the strongest AP - we use two different ones in our offices (Cisco and BlueSecure) - but most of them are fairly expensive and require either server-side software or a dedicated appliance. I haven't tried it myself, but the only AP range I'm aware of that claims to do proper handoff and is still cheap enough for home use is the Ubiquiti kit running UniFi